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1 definition by mtgm

 
1.
A sarcastic comment meant to express extreme annoyance and or disapointment in something or someone.
"My girlfreind is calling me... Big yay."
"We have no food in this house... Big Yay."
"Our furnace is broken and its 11 degrees in this house... Big Yay."
by mtgm February 11, 2008