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This stands for, "And it's not even close."

Probably started in a particularly popular poker forum, where people often ask whether they should fold, call or raise in certain circumstances. The answer might be, "Raise ainec."

Now being used in a wider sense, where comparisons are being considered.
"Claudia Cardinale is the most beautiful woman of all time, ainec."
by Javert October 17, 2011