Once a grogan drops off your arse by whatever means, (rocking, banging against the seat, coaxing with paper or your fingers) it becomes a turd. If you let the grogan remain, it becomes a massive dingleberry, once it dries. Grogans are moist; dingleberries are dry. (See dingleberry)

I drank a few pint's of Guiness last night which gave me the longest grogan ever this morning.

Jolly Drake shouted from the can that he was about to pinch a grogan. The boys in the living room laughed.

Man, I got a mouthfull of that grogan!

"I was in the toilet and someone knocked on the door and scared the crap out of me...bloody made me do a grogan"

Clint: Did you drop the Cosby kids at the pool?

Hank: Nah man. Some filthy bastard left a grogan.

oi i did the sickest grogan yesterday