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The melbourne mouth or commonly known as #mm is a facial expression in which one will open their mouth as wide as it can go. This expression is adopted in awkward situations or occurences where it is so awkward that a person will be unable to explain their actions, or defend themselves, and thus can only respond with a melbourne mouth.
"that lachlan is a genuine tosser"

"hes right in front of you mate"

melbourne mouth
by mm:( ) April 13, 2013
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