The Devil's Knocker

Like the devil's doorbell, but for your dick instead.

Giles: Why are you so happy today, John?

Steven: Last night, Kyle let me wrap the Devil's Knocker.

Giles: Nice!

-or-

Sherry: You look tired today!

Alex: I know, I was up all night ringing the Devil's Knocker.

Sherry: Nice!