To have more fun than someone else.
You: "I stayed home last night and cleaned my apt. with my roomie and then we watched Wizard of Oz on Netflix and crashed. What'd you do?"

Your friend: "I went to a bumpin all-night toga party with that fox Sarah, and we did the grind, and now we're an item. Good times had by all.

You: "Well, guess you outfunned me!"
by palabrajot September 25, 2010
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