Etymology
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smooch (v.)

1932, alteration of dialectal verb smouch "to kiss" (1570s), 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; smooching. As a noun by 1942.

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Definitions of smooch
1
smooch (v.)
snuggle and lie in a position where one person faces the back of the others;
Synonyms: spoon
2
smooch (n.)
an enthusiastic kiss;
Synonyms: smack
From wordnet.princeton.edu