n. something that is of relatively great size. : It was a whopper of an argument.
n. a very big lie. : That one's a whopper. I don't believe a word of it.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
whopper
1785, formed as if from whop (v.) "to beat, overcome." Meaning "big lie" is recorded first in 1791. Whopping "large, big, impressive" is attested by 1625.