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Originally: To order better meal than a fellow diner at a Whataburger restaurant.

Can also mean: To acquire anything better than a fellow participant during a similar time period.
Man, you got the buffalo chicken sandwich? I just got the junior hamburger combo. I've been out-whataburgered.

That Halloween costume is much better than mine. I think I've been out-whataburgered again.
by MrThursty October 21, 2009
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