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1.
A person who rides a dirtbike very badly.
When the rear of the dirtbike swaps from side to side.
Jim can't ride for shit. What a swappa.
by Guy Griffin October 23, 2006
 
2.
A quad rider who's expectaions to go fast far out weigh their ability to do so.

More throttle is applied than can be managed safely causing the rear of the quad to "swap" with the front making for great entertainment to all those that happen to be watching at the time.

A swappa will usually ride like this where there is someone watching although they have been known to crash with no one around.

Face plants are often the result.
That swappa has no idea what he is doing.

I crashed my quad, it was radical.

He just landed that jump sideways and then face planted in the whoops
by terantulazz December 10, 2010