The term "My Bag" was originally slang for taking responsibility for one's own actions. Somewhere in the early 90s people started saying "My bad" either because they wanted to change the verbage of the original, or because they just plain didn't understand the original meaning. "My Bag" is slang for "Baggage",ie: You take your own problems, put them in a bag and carry it on your own back. "It's on me, my fault, my problem. "My Bag" excepts and takes the burden, "My Bad" just dismisses it.
"Joe, do you need help paying for your rent this month? I know you haven't been working and would really like to help you out." said Nick. "No thanks man, that's My Bag." said Joe. "Oh, My Bad, I just thought you could use the help dude."
by garbailian September 23, 2011

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Top Definition
To label something as your preference.
Thats my kinda thing = "That's my bag baby!"
by Colpesh June 02, 2005

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An African-American phrase widely used in the midwest (circa '60-'70) usually meaning to take full responsibility for an incident or action. To apologize for a mistake.
Damn, man...my fault...my bag...you making me feel bad now...
by e-dub70 August 28, 2010

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The Michigan version of "my bad".
A mistake.
"Oh that was your beer I just spilled? My bag."
by RagingLeonard March 12, 2003

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