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
1 more definition
to steal someones eye during a helecopter ride in the upright possition.
Go away b4 u get jack knifed
by Squeky Clean February 12, 2005

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