A senile man who hums random nonsense sounds for no apparent reason.
1) Is that guy drunk? No he is just a Humming John.
2) What is that awful noise coming those garbage cans... oh wait its just a homeless Humming John.
by Suburban Policy October 16, 2012
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This is when you know the words to a song , but your somewhere in which you can not sing the words outloud , such as a classroom, so you use a low mumble voice to portray the words and hum from the back of your throat as if you were making the beat. In all reality your the only one who even has a clue what you are singing.
The kid behind me must have a song stuck in his head, he keeps mumble humming something I can't understand .

Hunter from Spanish class is a professional Mumble Hummer , I can never understand what he is singing even when he is trying.
by morningcartoons January 8, 2010
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San Francisco Giants manager Roger Craig: In his first full year as Giants' manager, Craig made "Hum Baby" the baseball phrase of 1986. A player he liked was a "hum baby," a good play was a "hum baby of a play", one could merely exhort "hum baby" from the dugout in lieu of a "let's go". . . the potential uses were infinite.
Hum Baby. Kevin Mitchell just made a bare hand catch.
by Giants fan October 20, 2012
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The act of performing fellatio or cunnilingus while humming during a shower or in a rainstorm.
OneLisa and her Fake Boyfriend Hum Dampstered in the hotel room before going to a $2000 pre fixe dinner with wine pairings.
by OneTC October 9, 2019
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The smell that lingers between the ball sack and ass hole.
Your breath smells like hum cakes.
by cano, bros March 11, 2014
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ho hum is a term used in place of *sigh* and "oh well"
dude1: i am so bored..
dude2: ho hum
by *//...im pretty like drugs...\\* September 28, 2005
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So-So, not great, not bad, not good
that movie was ho-hum
by paul getts July 10, 2005
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