Third-person singular simple present indicative form of oh

a expression of amazement

A sarcastic exclamation of displeasure.

The traditional cry of a chimney sweep advertising his services.

(slang, dated, mostly in the phrase 'like billy-oh') The greatest extent or degree of something; used in comparisons to indicate a superlative.

plural of oh for

plural of daddy-oh

An expression of delight and joy, or, sarcastically, dismay, resignation, frustration, or annoyance.

(Internet slang, humorous) Exclamation of surprise or disbelief. / (Internet slang, humorous) Yes; I understand or can relate.

very, extremely (often ironic)