Top Definition

The name used to refer to a pet who is acting like a total fucking moron.

Fuckernaught could also be applied to a person of an idiotic nature.
Rasta and Fari (kittens) were wrestling around the room knocking shit over left and right, acting like a couple of fuckernaughts.

"Kovu, stop being such a fuckernaught."

There were kids in the park last night, yelling and screaming and acting like a bunch of fuckernaughts.
by pend1 May 09, 2009
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