A lap dancing venue where the girls give fully naked dances, as opposed to only topless dances (i.e. those found at a "titty bar"). Such venues are often publicised less and more conspicuously placed than the average "titty bar" (i.e located down seedy back-alleys).
1) We went to a clunge pit on Gary's stag night.
2) I could have blown my inheritance in that clunge pit last night.