Top Definition
The day after tomorrow.

Today = Day 1
Tomorrow = Day 2 (as in, Two-Morrow)
Trimorrow = Day 3 (as in, Tri-Morrow)
If it's Saturday and you're talking to a friend who doesn't realize the Dallas Cowboy game is the Monday Night Football game instead of a regular Sunday game, you might say to him, "Dude, the Cowboy game is trimorrow, not tomorrow."

"Never put off today what you can do trimorrow."
by LangWiseAtty October 22, 2009
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