The kid got stroppy when he couldn't buy the toy and started shouting in the store.

stroppy 是形容词，源自英国俚语，意思是"脾气暴躁的、易怒的"。这个词通常用来形容人因为小事就变得不耐烦或发脾气的状态。在英式英语中常见，美式英语中较少使用。