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An indignifying response to a ridiculous joke, comment or remark; usually indicating a hint of sarcasm or speechlessness; usually pronounced with a deep pitch in one's voice, reminiscent of a walrus.

Pronunciation : Oh-hu
"I busted your girlfriend making out with an octopus, and she said it was the best sex she ever had."
by Burak Haliloglu April 16, 2006
anytime someone is busting your balls or is annoying, its the simple monotone answer.
randome guy: "hey bob, ur a dick-head"

bob: "uhhu"
by warrick April 01, 2004