Top definition
Zupdog is a trick to fool your friends. And it's relatively...hilarious.
Person A: Dude, what are you and I gonna do to deal with zupdog?

Person B: What's "zupdog"?

Person A: OH, NOTHING MUCH, YOU!? AHAHAHAH.

Person B: Man, you're stupid.
by D!zzy December 10, 2008
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