Reason Boner: An erection developed from arousal; the antithesis of NRB (no reason boner).
"Dude, that chick gave me a huge RB!"
by Nicholas Run August 8, 2007
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Person 1: Dude ew look at that fat chick...

Person 2: Awww dude I just got an rb
by dfray69 July 23, 2010
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A rob barelli, a guy who gives girl things just because they get with him
You Are such a fucking rb for giving her your chain =)
by Brooke =) October 27, 2004
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Miranda is such as rb. She always does the stupidest shit.
by Luke Flamer June 12, 2008
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A man who sits at his computer and touches his genitals when his mum screams his name
rb is gay roflmao
by Roy Peterson June 18, 2003
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