1. A noun reffering to any vicious animal that resembles a large squirrel, and only roams at night.

2. A racoon
3. Any squirrel like creature exhibitting burgular like qualities.
4. any squirrel like creature trying to kill a flock of baby ducks at night
5. Any squirrel like creature hiding underneath vehicles waiting to attack passer-byers
"omg that night squirrels going to eat those baby ducks!"
"Ah! There a nightsquirrel under my car!"
most commonly: "What the f*** is a nightsquirrel!"
by Anynomous Carrot September 14, 2009

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