noun which may take the genitive case particle 'no'
drunken; under the influence of alcohol
Used attributively with の to describe actions or states occurring while drunk, such as brawls, mistakes, or rambling. Somewhat literary or formal in tone.
酔余の勢いで喧嘩になった。
A fight broke out under the influence of alcohol.
彼は酔余の戯れにそんなことを言ったのだろう。
He probably said that as a drunken jest.
Compound of 酔 (sui, 'drunkenness') and 余 (yo, 'remainder/aftermath'), literally 'the aftermath of drinking'. The exact historical derivation is uncertain, but the spelling is conventionally associated with this meaning.