Contraction, American accent, or mispronunciation for the phrase "don't know". E.g.,

I dunno, but it's WAY famous dude!


I don't know, but it's WAY famous dude!

The above phrase was heard uttered at the Louvre in 1988 by two California surfer dudes admiring the Victory of Samothrace.

Added March 19, 2002:
According to the Oxford Dictionary of Modern Slang (John Ayto and John Simpson, eds., NY:Oxford Univ. Press, 1992, p. 61):
"Representing a casual pronunciation of (I) Don't know."

Initial use was in 1842 as noted in the main entry for dunno in the Oxford English Dictionary (2nd Ed.).

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