Browncappin is when you got to take a shit so bad that the round end of the turd starts poking out your asshole, usually accompanied by skidmarks in the underwear. I guess the first person seeing this happen up close thought it looked like there was a cap on the asshole. Some places in Maryland it is also considered a derogatory declaration aimed at someone. I mean, if somebody yanked down their drawers and browncapped you, how would YOU feel about it? Getting "browncapped" is plenty good reason to kick somebodys ass.
1) Man, I browncapped the ol lady last night and the ho threw a friggin lamp at me..... crazy biatch.
2) I was stuck in traffic this morning on the beltway for 2 hours. I was browncappin so bad that I had to pinch one off in a McDonalds cup.
3) Baby, keep on bitchin, you gonna mess around and get browncapped if you don't watch yo mowf.