"Tooshie" is a slang term for the buttocks or posterior. There are several synonyms for this word, including bum, butt, derriere, posterior, backside, tush, booty, rump, and behind. Each of these words is commonly used to refer to the same part of the body in different contexts. Some of these synonyms are more appropriate or acceptable in certain situations than others. For example, "butt" and "bum" may be considered more casual and playful, while "derriere" and "posterior" are more formal and medical. Ultimately, choosing the right synonym for "tooshie" depends on the tone and context of the conversation or written text.