Although once thought to describe the act of having a fit (i.e., a seizure), it has evolved into a ghetto way to say "fixin' to, about to, or going to do something."
I ain't fittin to take no spelin class.
by Robb H. September 23, 2006
Appropriate, suitable, acceptable
Her behavior at the dance ain't fittin.
by SSanf August 28, 2014