Means you are completely confused and show it on your face. Named after the expression used in the Smosh video If Movies Were Real
by Kane Bell July 21, 2010
Richard asked Joe "what does god look like?" and Joe replied with "Big Dunno"
why the donkey ate the rats burger was a big dunno
why the donkey ate the rats burger was a big dunno
by Kane Bell April 10, 2010