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2.
When a person or object is no longer available for a specific use due to someone else taking it first.
Charlie: Dude, who's that ridiculously hot chick over by the bar?
Dennis: That's Kate bro. Don't get your hopes up. She's Liam Neesoned. She's dating Greg.

Mac: Who the hell Liam Neesoned all my sleeveless shirts?
Frank: I think i saw Scumbag Steve rocking your cut offs at his place the other day.
by Rentz2Damhigh October 10, 2012
 
1.
.v) To punch or jab in the throat with lightning quick speed and agility, collapsing the airway and causing death within six seconds.

Variations:
Baby Neeson - .n) a flick to the throat causing a minor inconvenience and/or discomfort.
Down South Neeson - .n) the act of Liam Neesoning someone in the crotch area.
Spectator 1: "Did you see that? That guy just got straight Liam Neesoned!"

Spectator 2: "He's not moving...I think he might be dead."

Spectator 1: "That's because Liam Neeson finishes things."
*See: the film Taken*
by sbj1786 February 15, 2009