Very DTR is likely part of the squawking heard when one 1200 baud modem says hello and does the hand-shaking when connecting to another modem across a dial up telephone line. Remember when a Hayes 1200 baud modem was cool? Actually DTR is when you switch to speaking directly to the modem in a manual fashion I think.
an expression used when a person is ready for a smanging.
Kiki: Who are you taking to prom Nikhil?
Nikhil: I don't know, probably Elana cause she seems DTR
Edgar: ....DTR? you mean DTF?
Nikhil: No, DTR. Down to romp. It's much classier
Edgar & Kiki: Ohhhh.