The opposite of a detox.

When you know you're going have a ridiculous amount of alcohol over the weekend and you decide to go out for a few drinks the night before as preparation - it's the drinking equivalent of stretching.
"It's the stag do this weekend, the pretox will be in the local from 7 tonight"
by Matt4579 May 25, 2006
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The state of already being intoxicated when showing up at an event that involves drinking.
"Hey, just so you know, before we go to the club I'm meeting up with a friend so I may be a bit pretoxicated."
by _fluffy October 18, 2013
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