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MSB 

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A person with an extremely huge mullet who constantly wears sweatpants and snowboots in public places.
Big Dan is the biggest "MSB" in the whole world.
MSB by One Eyed Jack March 7, 2004

MSB 

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Maiden of Surpassing Beauty:

She is among the fairest maidens in the land, rarely seen in life and more commonly the denizen of fairy tales and the fervent dreams of youth. Her visage inspires feelings more acute and much less vulgar than lust, although both are likely to be experienced by the hapless onlooker. Whilst she may be dressed in plain attire during a sighting, you will always remember her, upon reflection, as if bedecked in regal garb and adorned with jewels. Her countenance is arresting. The heart is stricken after an encounter with this rare creature.
Dude, I passed MSB in the hall yesterday. I couldn't even look her in the eye, it was too powerful.
MSB by Angus Trumb September 10, 2016

MSB 

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Massive sperm build-up, when you haven't ejaculated in a long time
I'm walking funny because I have MSB
MSB by The Tinman October 3, 2017

MSB 

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Colleague: Yo, I can barely hear you..it sounds like you're driving?
Me: MSB
MSB by Kidius February 11, 2022

Msb 

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“Msb count:4
Msb by Nugget😚 September 4, 2022

msb 

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"msb" is often used by girls or women who is referring to a loved one or speacial person who is a boy/man.

"Gm, msb" (Good morning, my sweet boy)
msb by debby defines December 13, 2024
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