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2.
A motorcycle with a travel trailer attached to the back.
My Friend : Holy shit, what is that vehicle they are traveling on, fine sir?

Fine Sir : That, my friend, is a quadcycle.
by ct&db July 27, 2009
 
1.
Slang for an ATV.
Guy 1: What are you doing this summer?
Guy 2: Thought i'd finally take the quadcycle up on Sugarloaf Mountain and see what she's got.
Guy 1: Sounds awesome, and dangerous.
by Tex-Mex Shawn C. November 28, 2010
 
3.
a 4 wheeled vehicle that very slow.
we call my friend's 96 dx protege the quadcycle because we cant call it a bicycle.
by asspirate July 20, 2003