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An erection which can strike a man at any point in the day, seemingly out of nowhere, and not related to the man being turned on. Often striking at the most inopportune moments.
Girl:"Ew have you got a boner!"
Man:"No it's a randaboner, it's not a comment on your attractiveness"
Girl:"Well that's ok then, my apologies"
by rojo2195 January 26, 2015
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