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Short for "I shit my pants", generally used as a higher level of laughing, even harder than LOL or ROTFLMAO. Can also be used in the literal sense if someone actually did shit his/her pants.
Andy: I just stood in front of a group and gave a speech with my fly down
Chad: LOL
Andy: And I wasn't wearing undies today
Chad: ISHIMP
by Tread October 14, 2005
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