Phrase borrowed (more or less) from TV's "Wheel of Fortune", indicatingdisrespect for someone's mental abilities. Since generally the contestants on Wheel aren't exactly Einstein, telling someone to buy a fucking vowel is about equivalent to "Get a clue, moron!"
You think the War on Drugs is working? Buy a fucking vowel!
President Bush wants to help the middle class, eh? Maybe he should buy a fucking vowel with his family fortune.
I went to the Bears game this weekend wearing my cheesehead, and the fans there were buy-a-vowel drunk. I couldn't even comprehend their pathetic excuses for insults.
PERSON A: "I have a friend who has a friend who's friend has a friend that has a friend that knows somebody who knows a guy who knows a girl who's girlfriend has a boyfriend who went to a really bad doctor who's doctor's doctor's doctor's doctor ate a BigMac and flatulated on top of his flatulence until he fainted"
PERSON B: "Can I buy a vowel?"