Tushie is a playful, mild term for the buttocks, typically used with or around children: Go wash your tushie.
It comes from Yiddish and sounds affectionate rather than crude.
Adults sometimes use it for humorous effect: Get your tushie off the couch.
Also spelled tushy.
1. anatomy — buttocks, Fleshy seat area; bottom (Lowest point or underside); rear (Back portion or raise); backside (Buttocks or rear); behind · rump · posterior · derriere · seat · bum · booty · fanny · cheeks · haunches
2. childish — cute, Attractively charming; adorable (Extremely endearing); baby (Very young child); toddler (Child learning to walk); diaper · potty · bathtime · wiggly · chubby · jiggly · patting · spanking · changing · powdered
Opposites
BODY POSITION/LOCATIONtushie ≠ tummy Stomach, childishly; face · front · belly · chest · privates
REGISTER/FORMALITYtushie ≠ buttocks Fleshy seat area; gluteus maximus · posterior · anus · rectum · hindquarters