John Out 

When a person taking about eating massive amounts of food at all you can eat, for hours on end. But then stops before finishing their first plate when the time comes.

"You better not John out again at the buffet tonight, that's just tossing your money away"

John Out by Kiwiikins August 30, 2016

john it out 

a phrase derived from the occasion when one man, who many now know, flopped out his cock to kids at his fat sons sleepover. It is now used when anything is got out,collected,passed and most definitely, flopped.

'OI, Dave, I hear you have a saggy minge, john it out !'

john it out by st martins July 1, 2009

out john 

When you get in the port-a-potty at the end of a long hot steamy summer day and she still gives you a blumpkin.

Man I heard she was a freak but didn't believe it till she gave me an out John at the festival.

out john by Sandy, AE, Sphinkter September 17, 2017