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1.
Acronym for "Iron My Shirt, Bitch!"

Often used as a dismissive to feminists by chauvinist males.

Also used as a dismissive by gay men to other gays.
Feminist: Women should be allowed to play golf like you men!

Male Golfer: IMSB!
by JonMaker August 20, 2004
 
2.
the initials for "in my space boots". when talking on an instant messanger, the use of "rofl" and "lmao" is common.You simply add "imsb" onto the end. Thus creating "roflmaoimsb". "rolling on floor laughing my *** off in my space boots". Makes chatting online more enjoyable.
"....omg that's so funny!"
"roflmaoimsb"
by Nicole Stokes November 09, 2007