1. The terrible hangover you have the day after St. Patrick's Day.

2. Throwing up as a result of excessive drinking, either while drunk or while hungover. (Compare Montezuma's revenge.)
1. "Don't talk to me. It's March 18 and I'm suffering St. Patrick's Revenge."

2. "I'm never drinking again. I just spent half an hour in the bathroom, suffering St. Patrick's Revenge."
by fightxsong March 19, 2009
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