On Thu, 2 Sep 1999 P2052 at AOL.COM wrote: >It used to be "That's my bag," which was later shortened to, "My bag." I >think that "my bad" is folk pronunciation of this slang expression. Interesting. Then why is it used only when the speaker is referring to something at which s/he is bad or which is generally considered wrong, illegal, etc. (My experience with the word.) Bethany