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The douchebag index (DBI) is a statistic that yields the number of days since a person last bathed. It is found by multiplying the number of visible tattoos (VT) by the number of missing teeth (MT).

This dude's douchebag index is 27, meaning that he hasn't bathed in about four weeks. He has nine gross tattoos and three missing teeth.
by Duckbutt December 22, 2007
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