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The opposite of a laxative. When you take a lanative, it causes constipation. This is mainly used if you have raging diarrhea, and want to defecate in moderation.
Alan: Hey bro, you okay?
Dave: Nah man, I'm shitting like a fuckin' rabbit!
Alan: Here bro, take a lanative.
Dave: Oh dude, that's just what I needed! Thanks!
Alan: No problem, man!
by Billboard Baggins February 20, 2015
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