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2.
An abbreviated version of the phrase: "otherwise reffered to as".

Pronounced "or-tah"
This guy's name is John Doe... orta DJ Funky.
by Laura Marshall October 22, 2007
 
1.
A Texas slang word for "ought to."
You really think you orta be messin' with that snake?
by Kanji_Flufenoff October 15, 2010