look up any word, like cunt:
 
1.
When having sex with a girl from behind, you gag yourself, making yourself vomit. Use the vomit to lube up your hand, and insert it into the womans ass, fisting her ass while you are doing her doggy style.
Last night, I gave Heather the Dirty Derek. She loved every minute of it.
by Kyle Christie April 12, 2007
15 9
 
2.
when a woman is performing oral sex on a man while he is defecating on another omans chest
dude i totally dirty dereked those two babes last night
by drexrock July 12, 2008
2 7