A slang term for a prolonged, extended session of kissing — the kind that goes on and on, usually between a new couple. The '-athon' suffix (from 'marathon') signals something done at length or to excess, following the same pattern as 'talkathon,' 'danceathon,' or 'watchathon.' Typically used with a mix of affection and mild mockery for people who are visibly very into each other.
They disappeared onto the back porch and had a full kissathon while the rest of us waited inside.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(slang) A prolonged period of kissing.
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