Top Definition
The uncanny ability to detect when hideously ugly people are in close proximity to oneself, or are rapidly closing in on one's position.
Worker 1: It's after 9:00, is that heffer Katarina going to be in the office today?

Worker 2: Well, she hasn't called in. And on top of that, my ugdar is pinging like mad so she must be on her way now.
by FarmAnimal April 29, 2009

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