When encountering the misspelling "PnCM", it is likely that the intended word is "PNM" which stands for Post Nasal Drip. It refers to the accumulation of mucus at the back of the throat, causing discomfort. Other possible suggestions include "PCN" (Penicillin), "P&G" (Procter & Gamble) or "PBM" (Pharmacy Benefit Manager).