Means you are completely confused and show it on your face. Named after the expression used in the Smosh video If Movies Were Real
Jafro had a confused RIP Marv expression on his face after Rozzo baby boi said something confusing.
when something is completely unknown
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
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