Similar Words to Backside:
Arse
Ass
Back End
Behind
Bottom
Bum
Buns
Butt
Buttocks
Can
Derriere
Fanny
Fundament
Hind End
Hindquarters
Keister
Nates
Posterior
Prat
Rear
Rear End
Rump
Seat
Stern
Tail
Tail End
Tooshie
Tush
Definitions of Backside:
1. The side of an object that is opposite its front
2. The fleshy part of the human body that you sit on