The sound made when something absolutely amazing happens, (cumming on a girls face, doing a perfect headshot on CSS, getting a hole-in-one in golf), to perfect this sound you must have a fairly deep voice and put all your power into it until your throat hurts!

Rob: Finally fucked that girl Alex last night, as i cummed over her tits i let out the greatest 'UMMM!' ever, i'm not gonna lie, IT WAS GOOD!
Adam: Thats what i like to hear!

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Ummm - slang

The ultimate form of being bamboozled;looking a train of thought mid conversation and trying to come up with it on the fly.

“Billy, you know I identify as an Attack helicopter right?”
-“Ummmmmm...”

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Ummm

The response to a question that you know the answer to but don't want to admit, the response to a question you don't know the answer to or just a response to piss someone off.

"Can you help me reformat my hard drive?", ummm...

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Ummm

usualy said by a bloke when asked a question. any question as a matter of fact.

it can also mean the following:
no
yeah
err no way!
totaly
meh wotever
go away
ummm
*clears thoroat*

Girl: Do you have a crush on me?

Boy: ummm...

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Ummm

when you're trying to think of an excuse

ummmmm

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