Top definition
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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