A bronail is a male nail, or your brothers nail.
Could potentially be ugly and hairy

when you're hungover as shit after a spending a night drunk as a skunk

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.