The placement of one's face, specifically the mouth, into the area between a well-endowed woman's breasts, followed by a rapid shaking of the face in a side-to-side motion accompanied by yelling. The resulting sound that is created sounds similar to an outboard boat motor.
Sherry was wearing a low-cut top and Mike approached her and started motorboating in her cleavage.
Sticking your face between a ladys fun bags and blowing hard allowing the boobies to wobble on your cheeks.
I went motor boating with the missus last night.
The act of making an engine
noise when sticking your face in a woman's BOOBS
Michael: Did you hear what John did last night?
Buck: Yeah, I heard he was motor-boating that hot piece of ass.
Michael: Yeah, sick she was UGLY.
Buck: But it wasn't down there, it was up top.
Also something done to girls named yael by kids named michael
"yael's profile pic has someone touching her boob, don't they know that michael's motor boating property?"
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.
My buddy was so embarrassed cause he was motor boating in the cafeteria.
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
We all laughed at Fluffy's motor boating but Steve was not so happy when it left streaks on his carpet.
A great way to end an awkward conversation with a girl you don't want to talk to.
"This girl was in my room and I couldn't take it anymore so I motorboated her. After the motorboating she left."