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イチャイチャ ichaicha
Two people being unbearably couple-y.
What does ichaicha mean?
Cuddling, teasing, leaning on each other — affection at a volume other people can see. Said with a raised eyebrow whether you find it sweet or would like a different table.
Example
隣の席のカップルがずっとイチャイチャしてる。
The couple at the next table have been all over each other the whole time.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind ichaicha
The older verb is いちゃつく, and the doubled form is the version you hear now, built the way Japanese builds most of its atmosphere words: say it twice and it becomes a scene rather than an action. It covers everything from hand-holding to whispering, without ever getting explicit.
Its flavour depends on a local fact: public affection is much less common in Japan than in many countries, so a couple doing it in a café is genuinely a visible event. That is why the word usually arrives with a comment attached. In fandom it turns positive, describing exactly the scenes people are there for, and asking for more of it is entirely respectable.