It means you be lying. So like if you say something like I killed somebody yesterday and said later that you was fucking a hoe, someone you told that bullshit to, will say you be cappin
You: my side bitches Bianca and shonda'laquesha was getting fucked yesterday and this other side hoe showed up and I shot her.
Jon Jon: nigga you be cappin now stop lying before I take yo side bitches and yo momz
Jon Jon: nigga you be cappin now stop lying before I take yo side bitches and yo momz
by Stopcappinnigga September 29, 2018

an extremely anoying phrase meaning "that is very typical of you". commonly seen following the equally agitating expression "but really".it is a well-known fact that you cannot win a logical battle with the "you WOULD" person. the only known comeback to "you WOULD" is "i DID", but does not sufficiently bring down the person. you must emphasize "WOULD" or it loses meaning and sense completely.
person- "omg i totally forgot we had a huge test today!"
idiot- "you WOULD forget we had a huge test today."
person- "i DID forget."
idiot- "but really."
idiot- "you WOULD forget we had a huge test today."
person- "i DID forget."
idiot- "but really."
by youwouldaskmyname February 5, 2008

by Brendapiggy June 17, 2014

by ... Zjdbckdnznsjd December 11, 2020

by JoeDDenn December 30, 2017

Heard when your neighbors genetically engineered dog, Hand Banana, announces that he plans to rape you
by Dr. X, Family Counselor October 19, 2021
