The hairy midriff of a man whos shirt is too short.
"Dude, put your arms down, you have mandriff. I think i'm gonna puke!"
by Naynae May 09, 2007
When a man busts a huge load into a woman's hair after receiving oral sex, and not telling her about it. After it dries in her hair and scratches it, it flakes off, causing "man-driff."
Caiti had some terrible man-driff after prom with Chritian, Saturday night.
by marvo1212 April 15, 2010
when a guy intentionally or unintentionally shows his mid-section/stomach
Dude check it out that guys shirt so tight every time he reaches for something he keeps showing his mandriff.
by Panama_RR August 18, 2010