or SHOOT,MERK,KILL,POP,BLAST,ect as soon as you see a certain person.
Guy 2. "You mean Smash on Sight?"
Guy 1. "Yeah nigga just walk up on him n POWW!!"
Guy 2. "Shit do what ya gotaa do"
In the Netherlands it's also a slang term for cocaine.
radio operator: Yea don't sniff too much of that shit