Top Definition
when someone's breath is so terrible it smells like a fart

can also be used for someone who constantly talks nonsense or non-believable stories. Also know as a sh*t talker
That girl last night was a serious bum breather, I almost puked when she talked to me.

All he does is bum breathe, you can't believe any he says
by slash182 January 31, 2011
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