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
Get the mug
Get a gnarfle the garthak mug for your friend Vivek.