sneaky dave
a) When one is performing sex from behind, they quickly pull out from the vagina and put it in the anus without her having prior knowledge.

b) To grab one's tit when they are unconscious, asleep, or passed out.

c) A person who is extremely skilled at the art of sneaking.
a) "Dude, my penis smells like shit because last night i pulled a sneaky dave on her."

b) " Once that drunk chick passed out my hands went all sneaky dave on those titties."

c) " In order for me to get out of the house without anyone knowing, i had to go sneaky dave out the window."