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When a guy cant stop mastubating, or having homosexual sex.
Lenny cant control his slappybag.
slappybag by vivians_hot December 17, 2006
Related Words

slappin' the bag 

A drinking game in which you slap a cheap bag of wine (conveniently found inside a box of wine) and than take a big gulp from it. Known to create treasured memories you don't remember and pounding hangovers.
Duude, I was slappin' the bag way too many times last night, my head is killing me!
slappin' the bag by goutalout December 8, 2010

super market monkey slapper 

When you whack off in the car while your mom is in the supermarket shopping.
Hey,I saw Zak in the supermarket parking lot doing the ol' Super Market Monkey Slapper! And he smiled at me, that sick fucker!

Pussy Slappin' Butt Fucker 

a chick that is so depraved that the only way she can get off is by being aggravatingly fucked in her ass while she violently slaps her own clit or pussy, usually ends up to be a porn star.
James thought Jamie was a prude, but as soon as she broke up with him she turned into a pussy slappin' butt fucker. I guess she just did not like him.

slaptastic 

Good, as opposed to bad.
Trackstar's new album is hella slaptastic.
slaptastic by To' October 22, 2006

Slappin' the Grimlock 

Slappin' the Grimlock is the coolest new activity you can do. Any hip new "thing" can be referred to in casual conversation as Slappin' the Grimlock, in order to confuse other people- the point being that if you have to ask what the other person means, you'll never be cool enough to partake in the activity.
"Hey man, me and my buddes are gonna go slap the Grimlock for a while, you wanna come?"

"The hell are you talking about?"

"Never mind... I guess you're just not cool enough to enjoy a good session of slappin' the Grimlock."