buss (n.)

"a kiss," 1560s; probably of imitative origin, as are Welsh and Gaelic bus "kiss, lip," French baiser "kiss" (12c., from Latin basiare), Spanish buz, German dialectal Buss, Turkish bus, Persian busa, Hindi bosa.

buss (v.)

"to kiss," 1570s, from buss (n.). Related: Bussed; bussing.

Kissing and bussing differ both in this,
We busse our wantons, but our wives we kisse.
[Robert Herrick, "Hesperides," 1648]

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Definitions of buss from WordNet
buss (v.)
touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.;
Synonyms: snog / kiss / osculate
buss (n.)
the act of caressing with the lips (or an instance thereof);
Synonyms: kiss / osculation