Motor boating

[Jessica]

Sticking your face between a ladys fun bags and blowing hard allowing the boobies to wobble on your cheeks.

[Jessica]

Also something done to girls named yael by kids named michael

[Becky]

Unintentionally farting while walking. A short, but loud fart comes out with each step. So it sounds like a motor boat engine grumbling as you walk.

[PussyCat]

When a dog or cat sits and drags its rear end with its front legs to either scrape off feces or relieve their impacted anal glands. see also [boot scoot]