The act of giving/getting head while riding a roller coaster. The roller coaster can be of any given size, thrill, or style.
Joe: Wow, that's a big roller coaster! That must have been a fun ride.

Moe: Yep! It was even better because I got coaster dome from Zoe
by candyman81cb April 23, 2011
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This is the phenomenon that occurs when you see a ridicuously hot chick that makes you instantaneously pop wood, blow your load, pop wood, blow your load, pop wood, and so on. Similiar to the peaks and valleys one would experience on a roller coaster.
"Dude, you see that chick in the mini-skirt? I'm totally riding a boner coaster right now."
by A quickdraw/ripcord production February 23, 2006
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The Funniest roller coaster out there, that jsut so happens to be so funny that you must combine the words rollercoaster and lol to get the meaning across
dude lets ride that loler coaster
by The_JeFF October 16, 2006
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1. The array of positive emotions experienced while one is performing acts only justifiable by the lifestyle choice described by the phrase "You Only Live Once (YOLO)".

2. A constant chain of YOLO-style acts. Normally results in legal punishment of some kind.
(After getting arrested) "Dude, we just got off the YOLO-Coaster. Damnit."
by Turtletackle June 21, 2012
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You know when a girl is in junior high and her pubes are out of control and beast like, they get a little matted down from the panties and cotton panel. So if a boy goes downtown for a little action, he discovers the matted down pubes or the muff coaster.
Hey dude, I went to go finger blast a girl last night and it took me forever to get through the muff coaster before I could get to her fun tunnel.
by Hot for Histo October 29, 2011
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Apparently, it’s when you wake up after a bender and have a drink. As soon as you take your first sip, you suddenly feel inebriated once again
“Man, I’m so hungover
*Crack’s beer*
“Wooooh, coaster effect!!!! Let’s fkn gooo!!!”
by Leggers August 30, 2020
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