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1. Acronym for Dropping My Jaw
2. Replacement for SMH (Shaking My Head).
3. Can be used to show shock caused something amazing, disbelief at how damn stupid something somebody said was, and just utter surprise.
John: You know how the Texans were losing by 2 touchdowns?
Kevin: Yeah?
John: They tied it up. Then lost in overtime.
Kevin : DMJ.

*Andre Johnson makes an amazing catch*
Any person : DMJ!

Guy : Why're you back with him after he cheated on you?
Hottest girl in school : Because he has a car.
Guy : DMJ...
by JVdasht. January 02, 2011
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