Since it hit Netflix on Wednesday, Louis Theroux's latest documentary has had social media ablaze with chatter.
Titled 'Louis Theroux: Inside The Manosphere', the 90-minute programme sees the journalist explore how extreme influencers including Harrison Sullivan (HSTikkyTokky) and Myron Gaines are manipulating young boys with their ideas surrounding masculinity.
If you watch the documentary, you'll hear these influencers using a range of slang words and phrases - alongside secret hand gestures.
From 'red pills' to 'gymcels', these terms were once confined to the so-called 'manosphere', but are slowly penetrating the mainstream.
To help you decode this strange language, the UN has developed a handy Manosphere Glossary.
'Like many communities, the manosphere spreads its ideas with its own unique terminology and cultural references,' it explained.
'This includes coded language for gendered hate speech, pseudoscience and other harmful lies - even certain phrases that might be considered harmless outside of these online communities.
'While internet slang and the manosphere's glossary are always expanding, familiarizing yourself with some of these common terms can help you spot misogynist content in your feed.'
One of the slang terms frequently mentioned in the documentary is the 'red pill'.
This is a reference to the 1999 movie The Matrix, in which the lead character, Neo, is given the choice between a red pill or a blue pill.
'Red pill ideology, or to be redpilled, means to wake up to a reality that the world favors women over men,' the UN explains in its glossary.
'It suggests that people who disagree have taken the blue pill.'
In the manosphere, you might also hear men referring to a black pill.
This is the view among incels (involuntary celibates) that your romantic prospects are biologically determined, and that 'inferior' men have no chance of ever having sexual relationships with women.
The glossary includes several acronyms that are regularly used across the manosphere.
AWALT stands for 'all women are like that', and is often used to stereotype women, while FHO stands for 'female humanoid organism'.
What is the manosphere?
The manosphere is an umbrella term for online communities that have increasingly promoted narrow and aggressive definitions of what it means to be a man - and the false narrative that feminism and gender equality have come at the cost of men's rights.
These communities promote the idea that emotional control, material wealth, physical appearance and dominance, especially over women, are markers of male worth.
'"Female humanoid organism" is an insulting term meant to suggest women are not only less than men but less than human,' the UN glossary explains.
MGTOW (men going their own way) is a movement that suggests society is rigged against men, while PUA is a 'pick-up artist'.
According to the glossary, a PUA 'refers to individuals within a core manosphere ideology that teaches members how to coerce women into sex, as if a game, and mocks the idea of sexual consent.'
Three names you might hear mentioned are Stacy, Becky, and Chad.
These aren't influencers; instead, they are used to describe entire groups of people.
Stacy is an idealized, highly attractive woman that is considered unattainable, while Chad is her male equivalent.
'[Chad is] the archetype of an alpha male: a muscular, sexually successful man and the opposite of "incel" or "beta male,"' the UN explained.
'Often depicted in memes and used in racist contexts,' it added.
In contrast, Becky is used to describe a woman who is less desirable and is often racialised or class coded.
The UN hopes the glossary will help people to spot subversive and harmful content online.
'The manosphere targets male audiences in all digital spaces, including social media, podcasts, gamer communities, and even dating apps,' it added.
'Many men and boys engage with the content in search of forums to learn about men's issues.
'But the solutions and discussions veer far from healthy advice, promoting instead ideas of harsh self-discipline, emotional control and physical dominance over others, especially women and girls.'