also: ちんちんかも
noun, noun or participle which takes 'suru'
flirting; fondling; billing and cooing
Dated colloquial term for playful romantic or physical intimacy between two people, often with a light, affectionate tone. Can be used as a noun or with する.
あの二人、隅でちんちんかもかもしてるよ。
Those two are flirting and cuddling in the corner.
昔の映画では、恋人たちがちんちんかもかもする場面がよくあった。
In old movies, there were often scenes of lovers billing and cooing.