A phrase basically meaning "Oh no". First heard publicly on American Idol by Ramiele Mulabay, then appropriated by her roommate Syesha Mercado and repeated by her ad nauseum.
"Syesha, you song was terrible."
"Oh lo!"
by WordNaz July 11, 2008
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Short for, "Oh, Lord!"

As heard from American Idol (season 7) contestants Ramiele Malubay (who seems to have started the trend) and her American Idol roomie, Syesha Mercado.
"Oh, lo! I just sang like shit on national television!"
by AnotherKayly April 1, 2008
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