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The thing that happens when a guy has a boner and thinks it's noticeable, but it's really not because his penis is too small and he can't come to terms with this fault.
girl: DO you EVER get boners!

boy: Oh I do, just you never look at the right times.

girl: that's cuz it's an imaginary boner

by TrippedOutSkaterEmo January 19, 2009
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Jul 29 Word of the Day
Someone who used to be a potential girlfriend/boyfriend, but no longer is.
Tim: Zack, is that your exgirlfriend?
Zack: No, she's an expotential. We never actually dated...
by brownsuite September 24, 2011
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