An unstoppable asshole, (combination of the words Fucker and Juggernaut)
That guy at the bar was a real fuckernaut!
by ReconfigureYou March 22, 2010
Someone who massively posts useless crap while trying to flame and starts complaining when is about to get pwned. Combination of Fuck and Astronaut.
Don't fucking cry about it here on the internet you fuckernaut.
by gracie-hunter September 02, 2007