Kabedon

One use of this phrase is to describe the action of slapping a wall as a protest in collective housing, such as condominiums, when the neighboring unit makes too much noise.

This has become a popular tool to invoke the "clever move of confession" trope and for creating an intimate atmosphere.

[2][3] The term kabedon first appeared in 2008 when voice actor Ryōko Shintani described it as "lovely situation".

When this noise becomes too loud to bear, Japanese people tend to bang their connecting walls in protest.

[1] The practice of kabedon was borrowed into Chinese with the pronunciation bidong (壁咚, bìdōng) through television dramas like My Sunshine.