A mythical penis that from going flaccid to erect shrinks rather than grow, apparently due to retracting into the body, possibly from shame or fear.

Got the covid-19 vaccine

A shrinker is when a Male gets turned off to the point that his pecker shrinks to one thousandth of the original size

A guy that seems awfully attractive at first, but who's attractiveness seems to dwindle the better you know him. Basically someone who grows downwards in desirability. Disappointing, really disappointing. It's not even like funny anymore!

An individual that has aged to the point that they are no longer growing, but in fact shrinking.

The opposite of getting a boner. Your dick actually shrinks and goes inside your body.