騎脖子拉屎

1. • to take a dump while riding on sb's shoulders (saying)

     lit.

2. • to treat sb like garbage

     fig.

Character by character

• 騎(qí)sit astride
• 脖(bó)neck
• 子(zi)noun suffix, as in 椅子 yǐzi "chair"
• 拉(lā)pull
• 屎(shǐ)feces