Gravotron 

grav-uh-tron , When one takes an excessive ammount of gravol to feel hallucinagenic effects, they are known to be riding the Gravotron.

dude last night i was riding the gravotron and was tripping so hard

Gravotron by Josh Murphy March 30, 2008

Grasstronaut 

A person who is very high on marijuana.

Dude, I was so high last night.

You were a grasstronaut!

Grasstronaut by wizdog July 14, 2010

Graviton

A hypothetical spin-2 massless boson which is responsible for the gravitational fields we experience everyday. The graviton is the quantum particle of gravity.

Particle colliders have yet to find a single graviton.

Graviton by A.froman September 3, 2010

Gavitron 

Properly known as "The Gavitron", The Gavitron is a man bestowed with great powers of seduction and intrigue. His quick rise to fame was predicted by few, and admired by most. Always the star of the party, show, or scene; All the ladies want him, only the best can have him.

The Gavitron meets an Australian Girl:

Gavitron: Pleased to meet you, I'm The Gavitron.
Girl: Gavitron? Isn't that a carnival ride? I've ridden that before.
Gavitron: No. You're thinking about the GRavitron. But If you ever want to ride The Gavitron, Just let me know.

Later that night, She did.

Gavitron by The Gavitron November 27, 2004

gravitron 

A gravitron is the ride at those crappy city to city carnivals that spins real fast. It smells of vomit and sweat and features weight lifting benches on rollers along the wall. Your back is placed upon the bench with you in a semi standing position and the gravitron is activated. Once it reaches speed the benches slide up giving you the feeling of weightlessness. In actuality it is more the centrifugal/centripedal force that allows you to "stick" to the wall.

This guy i work with plans to buy a gravitron and travel the country as a carnie, but we were looking on usedrides.com and they're like $40,000 used!

gravitron by blake April 1, 2004

gravitron 

A "gravitron" is an all-glass gravity/vacuum pipe that is commonly used to smoke flavored tobacco and other legal substances.

I smoked out of a gravitron last night at my friend's place.

gravitron by Jon Evans May 27, 2006

Groovtronic 

Groovtronic means cool, sweet, groovy, nice and groovacious all riddled into one!

One was walking back from the Cathedral one Sunday afternoon, what a groovtronic serman one thought to ones self

Groovtronic by Jam Master J - Scone John April 22, 2009