the long, sharp finger nails(usually thumb and index fingers) of a man(usually black) who grows them out to use them to split blunts open. Once split open the tobacco is usually discarded and the blunt is then filled with high grade marijuana and smoked. Also, the pinkie nail is sometimes also grown in similar fashion to be used a little spoon to snort cocaine off of.
Stoner 1: "Yo, mayne i just picked up a swisha, lets break it open and fill it with that loud pack. But I been rollin for days mayne and done bit all my finga nails off. can u bust it?"
Stoner 2: "Yeea bruh, i got my bro nails
rockin right now, lemme bust that shit."
Stoner 1: "Word, B."