What is Gmdtt?
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GMDTT was first heard about by a player named jaycob on an online game "Maplestory" (Europe)
it was used most of the time in the game forums means GM Delete this thread.
a thread is made asking a silly question or just a spam thread you would see a GMDTT in the comments posted to mark that the thread is not needed.
See
Random Words:
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A question asked in place of 'whose problem is it, mine or yours?'
"Don't smoke too much, it's bad for yah&quo..
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Myspace term, pictures containing only half of a persons face.
lolz omg that girl is so cute, but she has halffacetitis!
See myspace, ..