It means Dubbed. It's a short name for AC3.Dubbed
The audio track(s) have been dubbed to match with the video track.
The same applies to DTSD -> DTS.Dubbed
Is this different from mic-dubbed and line-dubbed? My impression was that those only come as mono or stereo, but many AC3D releases have surround sound.
Edit: So apparently dubbing is just the process of adding audio to a video track, sometimes replacing or complementing the original one. The quality dependends on where the audio comes from, but all of them are called "dubbed".
If I had to guess, it stands for Definitive
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