Top Definition
This is an acronym used commonly by fans of the Scottish actor David Tennant who had portrayed the role of the Doctor in BBC's television series, "Doctor Who" from 2005-2010.

The acronym means: David Tennant is The 1 True Doctor.
Person 1: "Do you think the new doctor is any good?"

D.T fan: "No! DTiT1TD."
by WHOligan May 12, 2010
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