A hairstyle made popular in Saginaw, Michigan, in which a woman's hair is pulled up into a full or half ponytail and then pushed forward and sprayed, resulting in a bump of hair on the top of her head that makes her skull look convex.
Kyle: Did you have a nice time in mid-Michigan?
Kristi: How did you know I was there?
Kyle: Honey, the Saginaw Speedbump gives it all away.
When you hit a bump in the road while driving and go flying through the air. Meanwhile, your passenger unknowingly slips a dildo under your ass, spearing you as you land back on your seat.
I hit a giant pothole on the highway, and before I knew it, the gay hitchhiker I picked up had given me the San Francisco Speedbump.
A type of argument that basically says that character A is so much faster than his opponent that he can win the fight before said opponent is even capable of reacting or doing anything.
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.