Abbreviation for "dick in your mouth". Sometimes used as a quick way of smiting your enemies. Has other incarnations such as dimm - dick in my mouth, diya - dick in your ass, etc etc.
Came into use in an IRC chat room and quickly took off from there.
<Person S> Hi there!
<Person A> Hi!
<Person S> DIYM!
<Person A> :|
Prices shown in USD.
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