Crackin' a Fat 

Cracking a big boner. See erection

1.That chicks arse is so damn nice...I'm crackin' a fat!
2."Let's watch some porn".."What, just so you can see me crack a fat?"

Crackin' a Fat by UberJordan March 3, 2004

Crackin' Off 

To stroke your own penis repeatedly until you skeet, unless your mother comes in, then you become a serial killa.

Kid 1: He's been in the bathroom forever! What could he be doing?

Kid 2: Probably crackin' off!

Kid 1: Dude, that's not even an expression.

Crackin' Off by austin chester shane and bronte October 6, 2007

crackin' tits 

basically if you have good tits, then they may even get upgraded to the status of crackin' tits.

By jove frederick, i must say, that new piece of hotness of yours has a set of crackin' tits, not like your ex with those darned ghastly saddlebags!

crackin' tits by captaincrackpot March 27, 2009

crackin’ but fackin 

Telling the truth in the form of a joke.

He: Thanks for the coffee. How can I ever repay you?
Co-worker: Well, there's this diamond tennis bracelet I like.
He: Ha. Ha.
He: Oh, I see. You crackin’ but fackin.

crackin’ but fackin by Planet-38 February 21, 2009

crackin on 

in knox t.n it means to make fun of or call out.see grimey

cuz was crackin on girls shoes.

crackin on by uh oh rep 865,706,&423 4 life July 10, 2004

Crackin' the Yarbles

"Crackin' the Yarbles" - Hitting ones nuts (balls) really hard on something., causing great pain and discomfort. Also known as racking your balls.

The boy on the bike was just "crackin' the yarbles".

Crackin' the Yarbles by Thuggin It May 8, 2015

Crackin corn 

When you push out a massive fart and you blow a corn kernel across the room.

It was Jimmy's crackin corn that blinded his poor dog Rex.

Crackin corn by jmcycle August 31, 2017