Meaning

noun affectionate play (or foreplay without contact with the genital organs)

verb touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.

verb touch lightly or gently

originFrom Middle English kissynge, kyssynge, kessinge, from Old English *cyssing, from Proto-West Germanic *kussīngu, equivalent to kiss + -ing. Cognate with Middle Dutch cussinge (whence Dutch kussing (“kissing”)), Middle Low German küssinge (“kissing”), Middle High German küssunge (“kissing”). Compare also Old English cossettung (“kissing”).

Etymology from Wiktionary, CC BY-SA 3.0