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A buckthorn is a paid internet troll that annoys the shit out of people.

Derived from:
Buck: Slang for money.
Thorn: A small pricky little thing that annoys the shit out of people.
Hankdog is being a real buckthorn on this comment board.
by Zoltar Speaks! October 26, 2016
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2
The act of molesting a female while intoxicated by slowly maneuvering your arms around her while seated next to her on a couch. Similar to the plant known as buckthorn which spreads quickly and is hard to control.
Jacob: dude, what's Josh doing over there with that chick?

Ryan: he's totally got her pinned down with the buckthorn move.
by Trynnosaurus Rex June 30, 2010
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