A sex move where you insert you penis and two fingers into the vagina at the same time, making it look like and old school key. Best done wearing merkins.
I caught your dad keyholing the dude next door.

Last night my husband keyholed me. It was interesting, but good.
by Keyholersupreme July 17, 2021
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When two people having sex switch from one position to the next, without withdrawling the penis from any orifice.
She never really know what the true definition of victory until she had successfully completed the Keyhole Challenge
by Mae Rose January 31, 2017
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