smooch

I was so embarrassed when I walked in on them having a smooch on the sofa.

我走进去时正碰上他们在沙发上搂抱亲吻，感觉十分尴尬。

Didn't I see you smooching with Mark at Kim's party?

难道我没看见你和马克在金的聚会上搂抱亲吻吗？