开瓢儿

verb

to have one's head cracked open; to get one's skull split (often used hyperbolically or humorously)

Originally northern Chinese dialect (especially Beijing and Northeastern varieties). The term compares the head to a gourd (瓢 piáo) that is split open. While describing physical injury, it is frequently used in an exaggerated, joking manner among friends rather than describing actual serious trauma. Pronounced with erhua (rhotacization).