Top Definition
To jackneer: verb.

- to thwart or otherwise impede something from happening. To screw something up or shit yourself while doing something important to you or someone else.
I thought giving the speech would go smoothly, but looking at Jim's stupid face and Rob's hardcorevibes just jackneered my grove.

Don't jackneer this Derren, I'm seconds away from cumming!
by dodfurlongdongs October 19, 2011
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