nigger flappin 

the action of slurring your words with big old monkey lips to muffle the sound, causing it impossible to understand it

Man boy i cant understand what the fuck you're saying because nigger flapping like crazy.

nigger flappin by Superior One May 7, 2010

nigger flipping 

KFC and Ecstacy

I was nigger flipping my brains out the other day

nigger flipping by g0t geesus October 22, 2008