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(v)To get excited and all fired up over something. To be elated and very emotional over something that has or is going to happend.

Not literally an erection or hard, but more of a figure of speech. However one can literally be have a boner over something because they are that exctited about it.
Mike was all bonered up because he found out the Mets had acquired Carlos Delgado for peanuts from the Marlins.
by Mike O December 05, 2005
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