The text is a play on the format of the game show 'Wheel of Fortune,' where contestants can buy a vowel to help solve a puzzle. 'Schwa' refers to the unstressed central vowel (ə) in some languages, including English, which sounds like 'uh' and is often represented by any vowel letter. The humor arises from the contestant seemingly asking to buy a schwa, which is not a typical vowel purchase in the game, and also sounds like a play on the phrase 'I'd like to buy a vowel, Pat,' addressed to the show's host, Pat Sajak.
" I ' d like to buy a schwa , Pat . "