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1.
Word of disapproval, contextualised by the Sheep Clan to mock stupid or negative things.
Noob: i maek nu kllan u joyn pls!1!one!
Sheep: OOPAH!
by Spation September 07, 2008
 
2.
Internet sleng to write "ou pas".
A french expression that means "or not". You can say that whenever someone say something he believe to be right or appropriate just to show your disagreement.
person A: "look the sky is blue"
person B: "oopah"
by tradewindrider April 27, 2004