Top Definition
Also See "Haunch it up". The act of expelling a very large amount of crap after having held it in for far too long.

Haunching up can take anywhere from 10 minutes to 1 hour. Prolonged periods of haunching up may lead to back problems and hemorrhoids.
Andi: Where's Kelsey? I haven't seen her for 2 hours.
Ralph: She's in the bathroom "haunching up". Probably gonna clog up the toilet again!
by Ralph M. Frichtl December 25, 2009
8 Words related to Haunching Up

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