n, v. The act when one man buries his face in between another man's buttocks and vigorously throws his head back and forth while resonating his lips to make a "brrrrr" sound. Very similar to motorboating.
I almost passed out with delight when Henry knelt behind me, buried his face between my naked ass cheeks, and gave me a Sebago Speedboat.
A speedbooster is a word used to describe the scum within the NBA 2K community that abuse dribble move animations to gain a speed advantage over their opponent. Speedboosters make up the majority of the highest ranked people in the NBA 2k MyPark, for their lack of actual basketball IQ gives them a competitive edge.
"Dam yo we would've won that game if it wasn't for that no IQ speedbooster, fuck!"