後足で砂をかける（あとあしですなをかける）

Japanese vocabulary

Meaning: to do something spiteful as one leaves; to take a parting shot at; to kick sand (at someone) with one's hind legs

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “後足で砂をかける” pronounced in real videos (YouGlish)