Kicking someone directly in the asshole. Perhaps so hard that the big toe gains insertion.
"I'll ass jack you to the moon. My foot will rupture your uterus."
by Herschel Quintron December 29, 2003

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Top Definition
Inversion of jack ass. When calling someone a jackass is not enough you can refer to them as an assjack
That guy is worse than a jack ass he's a real assjack
by libraryguy March 04, 2010

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Nom. adj -- a person who is hopelessly stupid, offensive or socially hindered in the sense that their very presence has become a blight upon the fabric of existence. (Vulgation of the English "jack-ass," reportedly when the coiner of the phrase was too intoxicated to correctly say "jack-ass."
That John Ashcroft is such an assjack!
by Lane Haygood November 25, 2002

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Fun inversion of Jack Ass. Instead of calling someone Jack Ass just say Ass Jack.
That guy at work is a real ass jack.
by library guy December 15, 2009

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A malapropism of jackass
driver #1 to driver #2: "get out da' way, assjack!"
by j foxy August 11, 2010

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An object, for example a small firm pillow, placed under a womens ass to elevate her vagina to the best angle for sex.
"Hey honey, lets use the assjack tonight. I want to be sure i hit your G-Spot."
by rilecat November 17, 2016

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Some one who enjoys anal sex
I heard that girl in the train hat is a real Ass-jack in the sack.
by guiness69 January 25, 2013

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