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1.
mock-offhand response to a compliment, usually one on looks or personality.
person 1 you are just the best

person 2 well, what can i say..
by Angelacia March 13, 2011
 
2.
Whatcanisay, A word used if out of breath to express a sign of disbelief when speechless.
TV Crew: How did it go?
Fat Person: Whatcanisay.
by Louis Pierce April 14, 2010