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1.
Good quality craft beers made available at the beginning of a Beer Swap/Tasting for guests to enjoy before the official Tasting begins.
"We're still waiting for a few more people. Would you care for a prebeer in the meantime?"
by Hassan Ben Sober December 12, 2011
 
2.
Drinking the cheap beer or wine at home or in your car in the parking lot to catch a buzz before buying the expensive booze at the club
Q: What time you wanna head out?

A: I dunno, lets Pre-Beer it around 8 pm
by snausages333 October 21, 2006