Does foul taste in mouth mean dry socket?

Not necessarily. A dry socket will present as intense/increasing pain typically 48 hours after a tooth extraction.
See a dentist/doc. Brush, floss, and use a listerine-type mouthwash. If the taste/odor doesn't go away, see your doctor to rule out a throat infection, then see a dentist to evaluate for a tooth abscess.

Related Questions

Does foul taste in mouth come from dry socket?

See a dentist. Brush, floss, and use a listerine-type mouthwash. If the taste/odor doesn't go away, see your doctor to rule out a throat infection, then see a dentist to evaluate for a tooth abscess. Read more...
It can. A dry socket is a tooth extraction site where the blood clot was lost and the bone exposed. The bone can be dying back - thus the taste or it can be trapping food which then as it breaks down - also causes a bad odor/taste. Read more...
Yes, it may. Dry socket is specifically related to a recent tooth extraction. It could be foul taste from the dry socket, but if you've had it "packed" by your dentist, then it's from the foul tasting medicine. If you have not had a recent extraction, please see your dentist to identify the source of the bad taste. Read more...