Bearing witness to a particularly pleasant ass, which is both fit and capable of strenous activity.
Damn Holmes, witness the thickness!
(As a woman with an attractive rear end walks by.)
Indeed Watson, quite an assadocious young lady...
by emilygoo July 27, 2006
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Used to describe something that is really nice and large. Can be used in different ways.
That's a sick ass whip wit a thick ass rim wit a sick fridge with thick ass.

Damn, that girl got a sick ass wit a thick ass.

Donny, you're a sick ass foo wit a thick ass dude.
by johnnyfosho June 28, 2009
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