Speedboard 

n. downhill skateboard, usually built very heavy duty measuring 40-43" with wheel cutouts for large wheels. often mounted drop-through, with the truck baseplate mounted on top of the board.
v. downhill skateboarding, where riders use aerodynamic tucks and crouches to reach speeds as high as 65mph, drifting their boards at turns and footbraking, airbraking, or sliding to stop.

n. I just got a brand new speedboard! I can't wait to bomb some hills!
v. Hey, do you want to speedboard today? I found a nice hill over by the school.

Speedboard by Cliff J's longskate vocab August 20, 2006

Sebago Speedboat 

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.

Sebago Speedboat by GBart444 July 8, 2011

Speedbird 5280 

The act of joining the mile high club onboard a British Airways flight

A: "How was your flight to London?"
B: "Awesome. I got a Speedbird 5280!"

Speedbird 5280 by An Actual Airplane December 1, 2020

Mexican Speedboat 

A car so filled with Mexicans that the rear of the car hangs low to the ground giving it the impression of a speedboat speeding across the water.

"Hey did you see that Mexican Speedboat? I think the muffler was sparking."

Mexican Speedboat by Paddy O'Toole October 10, 2011

Cleveland Speedboat 

Like the 'Cleveland steamer' you take a dump on your girls chest- then you 'motorboat' her

Barry took a big dump on his girlfriends chest, then he performed a motorboat, resulting in a Cleveland Speedboat

Cleveland Speedboat by matty onearly August 25, 2010

Puerto Rican Speedboat

A single-wide trailer with indoor toilet.

Q: Hey what are you going to do with the money you won?
A: Probably buy a Puerto Rican Speedboat for my mother.

Q: Hey how's that essay Ramos doin'?
A: He's good just moved into a new Puerto Rican Speedboat with his wife.

Q: Oh that'll be good to have that indoor toilet for all nine of his kids.

Puerto Rican Speedboat by Paddy O'Toole January 5, 2011

Speedboat 

The sound one makes by placing his or her face in cleavage and shaking their face back and forth while exhaling creating a "brrrrrrp rrrrp rrrrp rrrrp" sound.

The hummer she gave me was so good, I gave her a speedboat as my way of saying thanks.

Speedboat by Michael October 21, 2005