When gas is rotating out loud in your stomach, putting so much pressure on your bowel region that you feel like, if you don't get to a toilet immediately, you will soil your pants.
Girl - "what was that noise and why is your face all red?
Guy - "I'm tryin to squeeze my cheeks together cause my stomach be gurfulling".
1. Expression of a fucked up situation, such as, but not limited to:
Car accident
Getting ditched
Popping it in the "wrong" hole Falling
Being aggravated
your best friend cheating on your with your fiance (Not from personal exp. but I'm sure that would suck).
2. A word meaning "Dammit".
Guy 1: "Hey man, think I could get some spare change?"
Guy 2: "Grrfuck dude, I spent my last bit of cash on this chick I met the other day."