Top definition
v. tr.

1. Referring to automobile accidents, when a car is totalled to the point of folding in on itself, much like a jacknife.
Holy shit, Zach's new car got jackknifed by a pickup truck! What a tard!
by SabDek April 19, 2003
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2
When her pussy is so tight, he jackknifed his dick when attempting to penetrate. His dick bends instead of entering.
Girl, you're so wet, yet so tight I jackknifed!

Or

Have you ever seen a dick jackknife?!
by Freyjawired November 23, 2016
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3
to steal someones eye during a helecopter ride in the upright possition.
by Squeky Clean February 12, 2005
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