When a bro knows that a girl has a disease and doesn't run interference for another bro who is trying to get with her. This is usually done to spite another bro very few incidents of this are accidental.
Todd: Hey man don't you think we should warn Garret about her?
Mike: Nah, I think a little unbrotected sex is just perfect for him.
by Ultimapimp June 19, 2010
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