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1.
When you "pull a Benedict Arnold", you sell out your side and join the stronger side of a situation out of fear, not honor.

Originated from the American general during the Revolutionary War whom switched to the British side of the war after being past over by congress for a promotion.
"I seen that mother fucker hanging out with those dudes that jumped me; Pulling a Benedict Arnold."
 
2.
1)to become the biggest traitor in the book

2)to convince one's partner that one is going to do one of the sexual Trinity and then switch to another
1)Lebron James benedict arnolded when he left Cleveland for Miami

2)My girlfriend doesn't like vaginal, so I was givin her tail but then I pulled a Benedict arnold and went vaginal.
by JERKER19 July 18, 2010
 
3.
When a sex partner is giving a guy a handjob, the guy ejaculates in their partners hand, then the partner slaps him across across the face with his own ejaculation.
Travis was completely embarrassed when it was revealed his ex-girlfriend had gone Benedict Arnold on him in the bedroom
by yumberlard May 05, 2009
 
4.
The act of switching your Facebook language to English (UK) to avoid the new Facebook layout.
Friend 1: I hate the new Facebook layout, it's so dumb!

Friend 2: If you switch to English (UK) you get the old layout back!

Friend 3: Damn turncoats! You are like a modern day Benedict Arnold, stop your whining and get over it!
by Flawless P September 23, 2011
 
5.
1)to become the biggest traitor in the book
2)to convince one's partner that one is going to do one of the sexual Trinity and then switch to another
1)Lebron James benedict arnolded when he left Cleveland for Miami
2)My girlfriend doesn't like vaginal, so I was givin her tail but then I pulled a Benedict arnold and went vaginal.
by xxxIlluminatixxx July 17, 2010
 
6.
1) Making your sexual partner belief you are going to perform one of the acts of the sexual trifecka (oral, vaginal,anal) on her/him and quickly converting to the other
1) My girlfriend doesn't like anal so I was going vaginal and got her with the Benedict Arnold
by pschizzle April 14, 2010
 
7.
A sexy move developed by the creative genius known as Pud. You hook up with a girl who lets you put it in her butt, then she sucks your dick. Then you slip up and kiss. It is called a benedict arnold because you are a traitor to yourself.
I am not proud to say: I benedict arnold'ed a girl my freshman year of college.
by Thomas Brinkley April 16, 2006