Top Definition
A Megafuckoff is someone who is so much of a whiny little bitch that anyone who comes into contact with them will imminently want to tear out there wind pipe and beat them to death with it.
It's origins are from the school grounds of one "Jealy" who is totally awesome. where he told one teacher that he was a Megafuckoff when "Jealy" was questioned about stepping on a plant.

Teacher- Hay don't step on the plant.. what did that ever do to you
Jealy- fuck off you Nature Nancy
Teacher- What did you say!?
Jealy Ok i'll rephrase YOUR A MEGAFUCKOFF NATURE NANCY!
or
Jonno- hay Jealy, it's Stoken
Jealy- Holy shit, megafuckoff alert
by Jealtech March 03, 2009

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