smooch v.

"to kiss," especially romantically or passionately, 1932, American English, an alteration of the dialectal verb smouch "to kiss" (1570s), which is possibly imitative of the sound of kissing (compare German dialectal schmutzen "to kiss"). An earlier alteration produced smudge (v.) "to kiss, caress" (1844). Related: Smooched; smoocher (1946); smooching. As a noun, "a kiss," by 1942.