common reference to male anatomy, used by other males to avoid sounding gay (guys that use 'dick' or 'cock' all the time, lead other guys to question their sexuality).
Me: Dude anyone tell you that jeff got your girl wasted and fucked her last night?
Other guy: Jokes on him. I gave that chunky piece of menstrual fluids girlfriend a mustache ride last night, plus my girlfriend hardly ever blow me anyways and when she does she never lets me shoot it in her face, time for a change.
NOUN: Another name for a penis. Used when speaking about getting a blowjob or having sex. Also used to make fun of another guy if they do something bad or embarrassing.
I gave that girl the mean D-Piece last night.
After I finger blasted that girl she started sucking my D-Piece.
Yo Tom, you just lost again... Your really sucking the D-Piece.