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1.
Four wheeling.

Driving a 4-wheel all-terrain vehicle.
We had a great day quadding in the hills today.

Quadding was pretty muddy after the rain storm in the mountains.
by Merrz February 02, 2014
 
2.
Engaging in coitus with a quadruple amputee.
Have you ever been quadding?
by flappy longberger March 16, 2012