Roadcoaster 

when riding shotgun with somebody, who, just for a split second, takes their eyes off the road, looks back and realizes they drifted 2 feet out of their lane and proceeds to jerk the car back in to position so violently that your neck suffers whiplash. just like riding a rollercoaster, it can also be done in smaller jerks that, by the end of your ride makes you look for the first bush to purge behind.

boy #1 -dude, you just see a ghost?
boy #2 - no bro, i rode shotgun with Becky in the roadcoaster!
boy #1 - oh, shit..bathroom is down the hall, 1st door to your left!

Roadcoaster by djxtc814 April 2, 2011

Roadmaster 

A Buick built in the 1950's and then was brought back from 1994-1996 along with the Chevy Impala SS. It sports the Chevy LT1 fuel injected small block V8, pushing 260HP and 335 lb-ft torque.

The 1995 Buick Roadmaster sedan was tested to run a flat 15 second quarter mile.

Hey look... It's a bird... no it's a Chevy Caprice... No it's a Buick Roadmaster.

AND IT'S KICKING THAT CIVIC's ASS.

Roadmaster by gungho1011201 March 15, 2009

roflcoaster 

If you see a teammate suicide, you gotta shout "ROFLCOASTER!!!!"

e.g. SKillMaN left a small crater. Everyone on Vent: ROFLCOASTER!!!!!!

roflcoaster by d3m0n January 11, 2005

Roadacoaster 

Roadacoaster: a roadway with sharp curves or steep inclines which feels like an amusement park roller coaster when driven fast in an automobile.

Buckle your seat belt, it’s a Roadacoaster!

Roadacoaster by TK78 May 20, 2024

Ronacoaster 

Wild and unpredictable changes occurring as a result of the Covid-19 pandemic.

2020 was a ronacoaster year.

Ronacoaster by Snobs_Anonymous December 29, 2021