tush

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The buttocks.
• noun A canine tooth, especially of a horse.
• interjection Used to express mild reproof, disapproval, or admonition.

from The Century Dictionary.

• An exclamation expressing rebuke, impatience, or contempt, and equivalent to ‘pshaw! be silent’: as, tush! tush! never tell me such a story as that.
• To express impatience, contempt, or the like by the exclamation “Tush!”
• noun A long pointed tooth; a tusk; specifically, one of the four canine teeth of the horse.

from the GNU version of the Collaborative International Dictionary of English.

• interjection An exclamation indicating check, rebuke, or contempt.
• noun A long, pointed tooth; a tusk; -- applied especially to certain teeth of horses.
• noun The buttocks; -- a euphemism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun now dialectal A tusk.
• noun A small tusk sometimes found on the female Indian elephant.
• interjection an exclamation of contempt
• noun US, colloquial The buttocks
• noun UK, colloquial nonsense; tosh
• verb transitive To pull or drag (a heavy object such as a tree or log).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the fleshy part of the human body that you sit on