motorfapping 

It's like motorboating except instead of doing it to a girls boobs you do it between her thighs

Hey Bob have you tried motorfapping your girl yet? Dude it's so sweet, girls get so wet!

motorfapping by Cosmocool December 26, 2011

Motherfapping 

Fap fap fap = an onomatopoei for male wanking, masturbating, etc. Motherfapping is then used in place of Motherf*cking.

I'm so tired of this goddamn motherfapping homework!

Motherfapping by Carple April 19, 2009