Booster Seat 

A sex act in which a man will recline the drivers seat of a car, then a woman (or another man, if thats how you roll) will proceed to get on top of said man and drive while engaging in the act of sex."

"Dude is that a sling for your cock?"

Ya, we got rear ended while doing the booster seat, no pun intended."

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Booster Seat by YouSick&$#@ March 17, 2010

Booster Seat 

If a person is in the sitting position and needs to elevate themselves they can use fecal matter to help. A person must excrete fecal matter in the sitting position and it causes the person to rise in the seat. The booster seat often causes a squirming sensation.

I went on a dinner date, the girl was taller than me do I had to give myself a booster seat.

Booster Seat by Teamcletus September 6, 2018

booster seat 

booster seat means short...like how a baby needs to use a booster seat

Girl 1: yo did u see isaac he’s rly short

Girl 2: yea bro he a booster seat

booster seat by someonethathatessomeone February 16, 2019

booster seat 

A guy with a huge ass which is disproportional to the rest of his body.

All the girls love Jordan because he has a booster seat.

booster seat by da black flame July 4, 2008

Booster seat 

Where you sit on top of another person and shit between their legs into the toilet

"no doors on this stall? Well looks like I may need to be a booster seat today"

Booster seat by Parale March 6, 2019

Booster seat 

When a short girl has a really fat ass

Damn bitch, did you see Mary’s ass? She has a whole booster seat

Booster seat by Maltese Falcon June 5, 2021

Booster seat 

When one person in a friend group is a year younger, they are known as “booster seat”

Where is booster seat? She is too young to be by herself!

Booster seat by Schmucky May 2, 2021