A ringspread is the act of bearing one's buttocks. Usually at any unsuspecting audience. Also known as Mooning but with an emphasised parting of arse cheeks . The ringspread can be modified to be a thirsty bulldog.
This is a true story. A passenger on a bus was going past a used car lot when he saw the salesperson extolling the virtues of some heap of shit car.
The passenger yelled out of the bus window to the folks in the car lot.
" Hey mate that car has an engine that is as good as this...(passenger in bus then bares his arse and pulls the arsecheeks apart ( the ringspread) much to the bewilderment of the salesperson and customer").
Other passengers such as myself roar laughing.