Expression of resignation or jollity

• Grass weeding tool picked up? Oh well
• Fodder reportedly nearly all stolen? Oh, well

Wiktionary Word definitions in Wiktionary
vb. To chant "heigh-ho", a cadence-count used for synchronized walking, marching, pulling, lifting, etc.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Heigh-ho \Heigh"-ho\ (h[imac]"-h[=o]), interj. An exclamation of surprise, joy, dejection, uneasiness, weariness, etc. --Shak.

Wikipedia Word definitions in Wikipedia
" Heigh-Ho " is a song from Walt Disney 's 1937 animated film Snow White and the Seven Dwarfs , written by Frank Churchill (music) and Larry Morey (lyrics). It is sung by the group of seven dwarfs as they work at a mine with diamonds and rubies , and is ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
c.1400 as part of the refrain of a song; by 1660s as an exclamation to express yawning, sighing, etc.; see hey .