For many years the world-record holder for the most consonants was the Caucasian language Ubykh […] But it has now been eclipsed by the reigning champion, Xóõ or, more pronounceably, Taa […], which is spoken by about 4,000 people in Botswana and Namibia, and which has somewhere between 84 and 159 consonant phonemes depending on the analysis.
Source: wiktionary