Definition 1 of 1
an arrogant way of defying a wrongdoing when caught red-handed. usually works well with younger siblings and peers. Off course, the witness will also respond with "what?" in a meeker tone indicating that they do not know what.
classmate walks in, sees what is happening, freezes.. the other fellow simply looks eye to eye and says, "what?" and waits...
Added 2011-07-09 by sykil