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An informal exclamation used in celebration to express congratulations and/or joyfulness.

Often a good substitution for the phrase, "fuck yeah".

Originating from the slang word "humdinger," referring to a home run in baseball; which evolved into a generalized cheer.
"Hum now, Belzy!"
"Let's go boys, hum now!"
"Yo, I found 20 bucks on the ground... that's a hum now!"
"I slammed that broad so hard, bro" "Hum now!!"
by marmarsbar June 19, 2014
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