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1.
Cutting up is like acting up or acting a fool.
(Kids yelling and screaming while in church) Damn those kids are cutting up!
by Deni January 14, 2006
 
2.
(verb) To mess up. To slip up. To fail to meet an expectation.
To "screw up"
Example 1:
-Person 1: John Claude has been spending less time with his girlfriend and more time playing PS3. Now, she's talking to other guys.
-Person 2: Damn...he's cutting up
Example 2:
-Person 3: I stopped showing up to class and my grade dropped to a B.
-Person 4: You're cutting up. That class is an easy A.
by NaijaBoy March 24, 2012
 
3.
When someones breath stink bad
"dude yo breath is cutting up !"
by Jade Mccrary October 03, 2009