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Inspired by the universally disliked banana-flavored runts, "runtsbanana" is used to describe something particularly foul tasting or generally bad/unpleasant.

Can also be used as a verb to describe someone acting in a way that is uncalled for and ruins everyone's time (to "go runtsbanana").
"Did you try Mary's casserole? That shit was runtsbanana."

"Yeah, the dinner party was going great until Mary got wasted and went runtsbanana on everyone."
by blackwolf333 June 29, 2012
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