Definitions by DoItForTheLolz

Lmaocoaster 

The act of laughing your ass off in such a tremendous manner that you suddenly find yourself riding the coaster of lmao.

Person 1: -roflcopter worthy joke-

Person 2: Hahahahaha, I just took a ride on the lmaocoaster.

Lmaocoaster by DoItForTheLolz January 17, 2011