A poker term:
花 'flower' refers to the suit (
花色),
顺 means 'in order/sequence' (
顺子 = straight). Together: same suit + consecutive ranks = straight flush. The unbeatable A-K-Q-J-10 of one suit is
同花大顺 or
皇家同花顺 (royal flush). Popularized by Texas Hold'em (
德州扑克) in Chinese-language poker streams.