Top Definition
(beɪs steɪn) Visible patches of sweat on a shirt caused by excessive perspiration as a result of a gentleman raging too hard at a dubstep Soirée. Recreational drug use can increase the size of the bass-stain
Mike had the craziest bass-stains after Electric Forest. He must have had a good time
by joelm420 December 04, 2011

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