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1.
1/ the fingers of a well experienced bongrat.

Used normally as a compliment or observation as to the efficiency of a persons bong pulling and packing ability.

May also be used as an insult/observation referring to the bong smell on ones fingers after an excessive smoking sess.
"Man, look at him use those bong fingers.. what a seasoned professional"

"Dude that is weak, get your dirty bong fingers away from me"
by willy donka March 26, 2009
 
2.
The callous you get from lighting bong hits with a bic lighter, repeatedly. Usually found on the index finger.
I need to change and start lighting bong hits with my thumb, I have a bad case of Bong Finger
by DrGizmo1960 July 21, 2010