When your cock is so enormous that a chick can only fit the head inside of her as she tries to ride you, and you can then have some fun by spinning her around on it like a barstool.
In gay culture the bar stool is the guy you would not have considered, you dont rate him. He doesn't impress you and you never considered him in any way. Perhaps someone asked if you were attracted to him and the thought had never occurred, you decide he isnt despicable but he definitely isnt attractive.
Oh, errrr, I guess hes less than a 5, he has an Ok personality, errrr, well he isnt ugly. I guess if I'm 60 and I dont want to live alone then errr maybe. I suppose hes the bar stool, definitelythe last bar stool.
A sports fan that relies on the most conventional opinion or intuition to predict the outcome of sporting events. Usually, this involves picking the team with the most popular players because of their assumed superiority over their opponents. The term draws off of drunken, opinionated barflies with antiquated knowledge of the sport in question. (abbrev. BSP)
ESPN.com writer and famous bar stool pundit Bill Simmons: "There's no way Brett Farve will fail to come through in the clutch. 24 interceptions this season? None of that will matter--it's the playoffs. The Vikings will win by 17."