Said the King To the River Lyrics

Lyric discussion by elbaszta 

Cover art for Said the King To the River lyrics by La Dispute

slightly feigned chagrin teh fuck does that mean? I don't understand.

It's "slyly feigned chagrin". Slyly means deceitfully/cunningly, feigned means pretended, and chagrin means embarrassment caused by failure. So he pretended to be embarrassed.