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1.
An Arsenault always has one moral in life. Do not trust anyone. Often hot headed, their angry will progress quickly. They are strong, and know what they want in their lives. Do not betray one, for you will pay the consequences. Family is no exception.
They must be an Arsenault.
by Oneofthem. August 19, 2011
 
2.
Verb: To arsenault is to do do nice gestures for a person with the secret intent of using it later as a manipulative tool for personal gain.
"HEY! I know for a fact you'd never buy me this Macbook unless you had something else in mind! What is it!? Don't arsenault me!"
by balloonfetish October 16, 2014
 
3.
an annoying person, place or thing

--can also be used to describe an individual or group of people who listen to country music too loudly on weekdays
Ross, stop being such an arsenault!
by Rondo 'Brady' Garnett July 13, 2012