What is Jag-off?
1.
Basically the same as calling someone a jerk-off or 'jack-off' or 'wanker'.
Watch Casino. This word'll pop up in every scene.
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2.
Used in place of "prick" or "asshole."
Mostly in Midwestern American urban centers.
"Benny? That guy's a fucking jag-off."
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3.
A chronic masturbator. Used more in America while wanker is used more in Europe
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Get to bed, you jag-off.