A michael j fox pee 

Is when you have to pee so badly you start to shake uncontrolably not un like michael j fox.

He's shaking like michael j fox. Yeah he's been holding it for like two days, he's due for a michael j fox pee.

A michael j fox pee by Servicepack September 18, 2010

michael j foxing

The act of shaking or getting the shakes/shivers.

Dude: Yo its so cold outside Man
Bro: Yeah no doubt i was michael j foxing

michael j foxing by Dizza March 15, 2006