When someone claims to have bought a round of drinks at a bar when they were actually free from the bartender. This usually occurs on pool league night, and was Started by a cheap dirtbag named Scotty E back in the early 1990's. The term is now mostly used as a punch line.
When picking up the free round from the bartenter you tell your team mates - "Hey everyone, I just got the Scotty round!"
by Scotty E October 06, 2007