They are not kissing but doing what is called trophollaxis.
https://en.wikipedia.org/wiki/Trophallaxis
They are eating basically. Because it would be not efficient if each ant would go home to a central feeding place, if hungry. Instead some are full and walk around and as soon as a hungry one signalling it is hungry, it gets something via trophollaxis. It is a kind of decentralized feeding.
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