.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.

Commonly used in text messages or social media as a short form for Very Sound Advice.

When a person or object is no longer available for a specific use due to someone else taking it first.