knowyourmeme.com
"Cuck, short for “cuckold,” is a term referring to a man with a female significant other who engages in sexual activities with other men.
Online, the term is often used as a pejorative to condescendingly describe a male who is sexually inadequate or sexually submissive."
reddit.com
"Cuck" is short for "cuckold". A "cuckold", historically, has meant a man whose wife is cheating on him and he's raising the other guy's kid.
More recently, it's been used to reference a man whose significant other is cheating on him."
urbandictionary.com
Another name for the great "Onision" leader of the cuckolds. In the cuck fashion, Onision is a liberal feminazi vegetarian only he has
millions of followers from all around the world. All bow before the cuck king, Onision, lots of the cuckold empire.
