When you wake up and there is shit inside your boxers.
"Shit, not another Growdie Lowdie!"
Bill: "Sam is headed over to that crowd of people!"
John: "He's a grumpy sort, he's going to join a growdy."
Slang for gross older man/person with dumb much too young woman/person.
Dude, he's like in his 50's and she's like 19 at best; that's growdy!