quite possibly the most fucking ridiculously exaggerated and stupid way to describe a very minor head injury, such as a tiny cut.
Bill: -hits head on wall
Mandy: dude, wtf did you do that for?

Bill: AW MAN I'VE CRACKED MY HEAD OPEN -shows pointless 'injury' off to friends. GUYS, LOOK I CRACKED MY HEAD OPEN

NO. THAT'S JUST A CUT. I COULD CAUSE MORE INJURY TO YOU WITH MY ARSEHOLE.
by crocodileyeast July 29, 2010
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To be laughing hard. A cross between cracking up and laughing my head off. Cracking my head off.

CMHO is what you put when you are texting. Like LOL, but CMHO!!
The lady in Wal-Mart was dressed in such a bad outfit, I was cracking my head off!!
by coopernapkin April 16, 2010
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dumbass twitter groupchat that isn't dead. we will live forver!!
kait: remember the og days?
vix: yeah, old crack my head was the best
by definitelynotqueer August 23, 2019
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