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1.
Johnny Cashing oneself is the act of wearing all black: black shoes, black slacks, black tie, black shirt, black coat.
John: You see Jake over there?
Max: The guy in all black? Yeah! He's Johnny Cashing tonight.
by Vaultsy April 08, 2011
 
2.
The act of having a 'ring of fire' after an eventful night! Or after an extremely hot curry...
Oi mate, shouldn't of had that vindaloo last night! Been Johnny Cashing all day!
by Colonel delicious June 18, 2013