Fiend hit
When you smoke a cigarette off the but you hold it and smoke through your thumb and pointer finger to act as a filter rather than putting your lips on the actual cigarette filter. Some trick fiends would do to avoid catching any disease from whoever previously smoked it.
"Hey dude I went to walmart and got a couple boges from the ashtray, you want one?"
"Yeah, but im gonna fiend hit it."
"Yeah, but im gonna fiend hit it."