SOFTsquelchy mud or ground is soft and wet and makes a sucking noise when you walk on it 〔烂泥或地面在人走动时〕吧唧吧唧作响的
Examples from the Corpus
squelchy• If you don't, be prepared for a black, squelchy, energy-sapping struggle, especially in wet conditions.• Instead they form squelchy peat, which gradually builds up on the surface.