"The Whummil Bore" is Child ballad 27.[1] A whummil is a tool for drilling holes.
The narrator served the king seven years and "saw his daughter only once"—meaning saw her naked, through a whummil bore. She was being dressed by her maids.
Only one variant of this ballad exists.[2] "Hind Horn" appears to contain a stanza from it.[3]
This is recorded on the Steeleye Span 2006 album Bloody Men.