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The act of wiping the rim of a barmans bumholes sought from a bar, so as to remove the taint of rat poo that is likely on the bottle from when it was left outside for storage.
verb- to derat, pronounced dee-rat
oh man I can't believe you just drank from that without deratting it!

derat that bottle before you drink from it!
by Mr Untouchable January 17, 2008

Words related to derat

bottle deratting piss rat rat piss