The occurrence of ashy remnants on one's finger (generally index) from cleaning the bowl of one's piece.
Hey, whoever takes stoner finger tonight gets the first package of peanut butter M&Ms.
Son, I know you smoked tonight because of your tell-tale stoner finger!
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it is when your index finger turns black from poking the bowl. it is normally a constant thing because your always smokin. yeahhhhh
"hey man my girlfriend knows im smokin agian. she saw my stoners finger."
"sucks dude."