looneycunt 

As in narcisistic, crazy, cheating, lying, ex-wife.
Beyond crazy. And a cunt.

"

That Looneycunt cheated on her husband while fully engaged in narcisistic abuse on him.

looneycunt by Survivor3 June 4, 2019

looneytunes 

When somebody "loses" their reason and commits or performs an act of lunacy and or violence usually only seen on the classic cartoon series of the same name.

Dave went "looneytunes" when that guy looked at his girlfriend!

looneytunes by Stephen Forster March 11, 2005

Looneytuneyian 

A weird dude who’s crazy & childish.

Damn, Pablo must be a looneytuneyian cause he’s crazy af !!!!

Looneytuneyian by Ella Enchanted February 3, 2019