Dude, I took the biggest McGuinty this morning and was late for work.
Son, I was awake when you came home late last night so don't try to McGuinty me!
1. An individual, found in a group of others, who does not have anything to offer or does not bring anything to the "team".
2. A person who only thinks about themselves.
- "Dude, you grabbed yourself a beer and I said that I needed one too. You're such a McGuinty!"
- Dalton McGuinty (Premier of Ontario, Canada)