The Dumb Bitch 180 is where a person walks up to someone they don't even know and says"fight me bitch!" just to act big and cool. the results are not good because when you do this 100% of the time you will get you ass kicked.
"Bro did you hear what happened?"
"No what?"
"Carlee pulled The Dumb Bitch 180 and got her ass beat."
"Damn bro.