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Meaning "Don't Make That Dirty"...This is said after you realize you have set someone up perfectly for a "that's what she said" joke or some other dirty comment.
Michael: So how was your rowing practice out on the river this morning?

Veronica: It was long and hard...I am so worn out and sore...

(moments later)

Veronica: Oh my god Michael dmtd!!!
by VinnyT:) August 18, 2009
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