the result of not washing your penis after unpretected vaginal sex
"i know i got laid last night cause the penis-crust no lie"
by 4 Points October 14, 2009
1 more definition
crust of poop that has rested on the penis for hours of time after anal penetration. ( usually dried out poop on the male genetals....)
my penis crust is very itchy today dear watson.
by The Freak of Texas April 22, 2006