Derogatory, widely used in dating / relationship discussions on Weibo and 小红书. Usually 妈宝男 (mama's boy) specifically; 妈宝女 exists but is much rarer.
culture
Key red flag in Chinese dating discourse along with 凤凰男 (small-town son lifted into the city). Pop-psychology blogs pair 妈宝 with the concept of 原生家庭 (family of origin) problems.