What is Blowcaine?
1.
Slang term for 
Dope Fiend #1:"Dude I got some poppers and amyl nitrate and some nose candy. Wanna get fucked up?"
Dope Fiend #2:"What the fuck is 'nose candy'? If you mean blowcaine then lets go just leave those poppers and amyl nitrate outta the mix."
See