Uncle Reggie 

The smouldering cardboard remaining when a joint has been completely smoked. Hardcore potheads will claim that this is where the joint is at its most potent. Some will even go as far as to smoke the skin of their own fingers before finally putting out the joint.

Don't insult me by trying to give me uncle reggie

Uncle Reggie by Bracey November 27, 2006

uncle reggin 

used as a joke to say loudly as reggins are near

How is uncle reggin i havent seen him in ages

uncle reggin by Brycecreamman January 14, 2009