schmunzeln, vb., ‘to smile good-naturedly, simper,’ frequentative of MidHG. smutzen, smotzen, ‘to smirk, smile good-naturedly,’ to which MidHG. smutz, ModHG. (dial.) Schmutz, ‘kiss,’ is also probably allied. It is perhaps connected with Schmatz, schmatzen (from MidHG. smackezen).