1. An expression to indicate displeasure at an amount of work.
2. Indicative that someone has done more than is necessary.
Student 1: That took forever.
Student 2: That's DTM.
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Usually used when a person starts talking about lots of numbers and expects the other person to figure out what it means on his or her own.
Bob: I'm downloading 5 different 150 megabyte files simultaneously at under 500 KB/S. Dtm.
Jim: Sucks for you! Get better internet.