Top Definition
The phenomenon of shrinkage apparent in the male genitalia during and immediately after participation in physical (usually sporting) activities.
“Bloody hell Brian, you’ve got a knob like a pre-pubescent schoolkid! What's going on?”

"Oh don’t worry about that, I’ve just got back from a 5 mile jog and I’ve got a proper Sportsman's Willy”
by Beztheowl July 29, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt