pop the cap 

peeing early in a night of drinking thus causing you to piss more frequently throughout the night

Dude Greg don't pop the cap so early, or you will be pissing all night

pop the cap by Jkruk1 January 25, 2009

Pop a cap in the devil 

a line often heard in gangsta rap meaning to pop a cap in a cop. because blacks are fucked over by cops all the time and they have had enough of that bull shit.

whats your take on that line John pop a cap in the devil.

Pop a cap in the devil by Deep blue 2012 November 2, 2009