An adjective used to describe something cool, awesome, excellent, outstanding, or crazy. It is definitely a superlative adjective, only used when the subject is extremely good or amazingly superior, or there is much energy involved in the speaker's passion about the subject or the excellence of the subject itself.
Usually preceded by "fucking"
Usually preceded by "fucking"
I went to that DMST show last night, they were fucking gnash!
You got us there in no time, driving fuckin' gnash like that!
The protest was fuckin' gnash man, even fucking Jane Fonda showed up!
You got us there in no time, driving fuckin' gnash like that!
The protest was fuckin' gnash man, even fucking Jane Fonda showed up!
by fuckdc June 4, 2007
Get the gnashmug. by Kraaazzy March 1, 2009
Get the Gnashmug. by NuNs gone wild February 12, 2004
Get the Gnashmug. 
Involves two persons. One individual with food or some chewable foreign object in his or her mouth positions said on their upper or lower teeth. The other person positions their mouth in such a way as to chomp or "gnash" the food or foreign object. During the gnashing, saliva is usually produced and maybe used as a lubricant for various sexual activities.
by STUN January 8, 2006
Get the gnashingmug. by honoredebalzac February 15, 2008
Get the gnar gnar gnash gnashmug.