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A sexual act involving a person with a bus pass. Fucking a Cougar or a Panther.
"It's Grab-a-granny Friday at all branches of Wetherspoons. Come on down and enjoy a night at the museum!"

A:"Where's Bobby tonight?"

B:"He's having a night at the museum with that 60 year old he pulled last week."
by Gasse September 08, 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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