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1.
When you are so excited to eat your Reese's that you forget to take off the SECOND rapper that is inconveniently the exact same color as the chocolate.
Ex 1:
Person 1: Hey man whatcha eatin?

Person 2: Wassup bro, just a Reese's peanut butter FUCK!

Ex 2:
HAHA screw you guys, I have a Reese's Peanut Butter --- FUCK!!!!
by KoolAid Addict April 06, 2010
 
2.
When a man covers his penis in peanut butter and then fucks a girl in the ass. She then shits over his dick and eats the combination of shit and peanut butter
Dude yesterday was valentines day andni gave the girl a reeses peanut butter fuck
by Sayyes to satan February 14, 2011
 
3.
Noun: A sexual situation in which a woman of Asian decent in sandwiched between two men of African decent.
Warn your kids not to accept any Reese's Peanut Butter Fucks next halloween.
by RARL August 08, 2009