Top Definition
To have sex with an exceedingly unattractive, usually fat person, especially whilst inebriated.
Derived from the movie Coneheads wherein Beldar must fight a hideous, greasy tusk-beast.
Damn she was fugly, but my man was mackin her friend so I had to gnarfle the garthak.
by Santi July 12, 2005
1 Word related to gnarfle the garthak

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