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1.
Word made popular by the Red Hot Chili Peppers' song "Get on top" is just a name for a person that you either hate or are just joking around with.
"Yo whatsup cuntilla? You still lickin dat niggas asshole? Cause i am bitch keep yo hands out of my anus!"
by beth March 01, 2005
 
2.
A contraction of the words "cunt” and "Godzilla".

It refers to a lady who has a very "demanding" genital area.
The lady I hooked up with last night was a real cuntilla, and of course I did my best to satisfy her.
by Panchoman Jr. November 10, 2006