Estimated Time of Passing Out. Often referenced to during social drinking events, or pre-gaming drinking festivities.
Clyde: Man this beer tastes great, I'll probably drink a million of these tonight.
Rusty: Hey take it easy man, your ETPO is gonna be like midnight, you know if you pass out too early we're gonna smoke all your shitty ass weed with out you.
by Wa11sagna April 22, 2010

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