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Aborigines who live under a bridge. They mostly sleep all day but at night the venture out to bum durrys and money off other people. Mostly found in Townsville.
Man 1: I went walking through the mall the other day and one of those damn underbridgines came out and asked for a smoke!

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Girl: I swear everytime I walk over that bridge those underbridgines upskirt me.
by Maggie8493 January 19, 2009
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