When spoken by the non-Tenor, "bleh" is a simple interjection. However, when spoken by a Tenor, "bleh" transcends all languages, and can mean anything that the Tenor speaker wishes it to. This extremely advanced form of communication is understood and spoken only by Tenors.
"Bleh bleh bleh bleh bleh bleh bleh bleh bleh." Translation: "Wow, she's really cute, I wonder if I could get her phone number... Wait a second, I'm a Tenor, of course I can."