The act of making an engine noise when sticking your face in a woman'sBOOBS.
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.
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.
It means the activity of putting one's face between a woman's breasts, and rocking turning one's head rapidly from side to side while making a noise like a motorboat.
"Motor-boating her tits and gobblbbl bbl bbl bbl..."
It means the activity of putting one's face between a woman's breasts, and rocking turning one's head rapidly from side to side while making a noise like a motorboat.
"Put your head between her tits and go bbl bbl bbl bbl bbl..."
"I heard Jimmy was motorboating Bella at school
she said it tickled"