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Yelling so loud that you can't understand what they are saying, loud mumbling.
Could you yell any louder, you are shmumbling with fucking nonsense.
by HellowIamEth June 07, 2016
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2
A mix between shouting and mumbling.
A : DUDE YOU'RE SO ANNOYING I CANT STAND YOU BLAH BLAH
B : Man, can you please stop shmumbling?
by dollarinthewoods June 07, 2016
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Singing, humming, and mumbling your way through a song, that you don't entirely know all the words to. Or don't even have the faintest idea what the tune is, yet you still feel some innate obligation to vocalize some noise with the song.
"Hey, turn off your radio!"

"No way. Why?"

"Cause that girl keeps Shmumbling along with every song! Its driving me crazy, learn the words or even get the tune right! Ugh."
by Wardrobe Lamppost November 24, 2009
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