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(noun) A person, thing, or event that prevents you from taking a much needed shit, and may or may not consequently cause you to shit in your pants. May also be used as a verb (shitblock). The person could be a cop who pulls you over for speeding - you were speeding because you had to shit so bad. It could also be an annoying guy or girl at a party who stops you to make a bad joke, or, for those in grade school or highschool, the teacher who will not let you use the restroom.
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