Top Definition
Acronym for "My Balls Are Growing." Used to describe feelings of swelling pride upon a great success, epic achievement, or otherwise awesome act. Also may be used to describe an incident in which ones balls might actually be growing, in which case medical help should be sought immediately.
Dude, did you see me picking up that chick? MBAG!
by mdgw August 29, 2010

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sticking M&M's up your balls for sexual pleasure, then letting your partner eat them off.
" Damn, she M Bagged me GOOD last night"
by lizard100 July 19, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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A scrotum with a letter M on it. Usually seen on extremely fucked up mario queers.
Guy: *fucks Girl hard*

Girl: *moans*

Guy: *jizzes in Girl's pussy*

Girl: *looks at Guy's M bag* Omg, I had sex with a fucking nerd!

Guy: Oh shit! *teleports away like a...wierd...person?*

Girl: What the fuck?
by Sn-OOOOOH! March 11, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt