Someone who lets others run a train on their girl.
Yo, did you hear about Sneako and his girlfriend? What a cuck!
1. A man who is in a relationship with a woman who has sexual relations with one or more other men; synonymous for wittol or betamale.
2. A weak, dumb, and/or insignificant man who typically allows everyone especially women to use him for their own benefit, regardless of how severe the negative consequences are for himself; synonymous for soyboy.
3. A liberal/leftist; one who identifies as a liberal or adheres to leftist/liberal ideologies, such as social justice, modern feminism, identity politics, white guilt, communism/socialism, mass censorship, shadow banning, gun control, etc.; synonymous for S.J.W. social justice warrior, snowflake, or pussy.
Protester: Guns are made for killing! Orange man bad! Capitalism is evil! I'm ashamed for being white!
Regular Person: I thought the left was supposed to be progressive....
Protestor: NAZI!!!!!
Regular Person (shaking his head): Fuckin' cuck.
A man who's a little baby bitch, lets his wife/significant other have sex with men typically with bigger penises. May also be known as a penis licker.
"Sneako admitted to being a cuck after watching his girlfriend get fucked."