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1. (While driving at a minimum of 60) To touch or rub the side of a 18-Wheeler or Greyhound sized Bus.

2. To go down on or eat out a fat chick.
1. Dan almost wrecked his car while trying to graze a biggin.

2. I got so hammered last night I thought I was kickin it with this sweet hottie but all I did was graze a biggin.
by Titties & Waffles October 25, 2007
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