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1.
All Terrain Vehicle (ATV)

Small, single rider vehicle that weighs from 300 - 600+ pounds. Meant to explore parts of this world that no Jeep, Land Rover, or Truck were ever meant to go. They come in wide varieties (auto, manual, semi-manual) (2-stroke, 4-stroke) (sport, utility).

Some brands are Polaris, Kawasaki, Honda, Yamaha, Arctic Cat, Bombardier, etc.
Let's go ride the four wheelers, TOMMY!

Tommy got his four-wheeler stuck in a creek! I'll go get my four wheeler to pull it out.
by ATV Man April 08, 2006
 
2.
a truck drivers' term for a regular car on the road.
Goddamn it! that fuckin four wheeler cut me off again!!
by bojizzle January 21, 2007
 
3.
One up from the tricycle, it is a foursome. Could be 2 guys and 2 girls, 3 girls and one guy, any combo really.
She had the hots for 3 different guys and really wanted to try out the four wheeler with them.
by Sashey November 18, 2007