motorsubmarining 

The motorboating of back boobs.

Remember that fat girl from last night? I was motorsubmarining her for hours.

motorsubmarining by unearth December 30, 2011

motorsubmarining 

To tit-fuck the back fat of an overweight woman.

"Bill's wife is a really fat ugly bitch, huh? Look at those massive backboobs!"

"Yeah, but motorsubmarining is his fetish."

motorsubmarining by DrPhilly December 30, 2011