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1.
when somebody says something so utterly stupid that it simply has to be shouted sarcastically accross the room
aimee: are polar bears made out of fibre-glass?
frank: O DEAR!!!
by Tom Joyce May 18, 2006
39 11
 
2.
Being shocked beyond all reason and no other words that can escape your mouth.

Can be used to express shock, grief, amazement, disbelief, annoyed, etc.
Guy 1: Who is Chuck Norris?
Guy 2: Are you serious?
Guy 1: Yea.
Guy 2: O dear.
by Baron S. July 22, 2009
24 3