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Hebrew slang. Anything to do with making out can qualify as Mitnashnesh (mitnashneshim, nitnashnesh... blablabla present past and future...) also, you can describe a guy as mitnashnesh if you're suggesting he's gay or has a strong feminine side.
Making out:
1. We were mitnashneshim all last night (past)
2. Look at them mitnashneshim (present)
3. Wanna lehitnashnesh (future)
1. God! He's so mitnashnesh
2. The only thing that's bad about him is that's he's such a nashnash...
by Dude3 April 14, 2005