Noun, Noun which may take the genitive case particle 'no'
slight intoxication; being tipsy; mellowness
そういえば、電車の中で隣に座ったほろ酔いのおっさんに、自分の俳句を見て欲しいと言われたことがある。Now that I think of it, I've been asked to look at a haiku he'd written by the tipsy bloke sitting next to me on the train.
Also written 微酔い【ほろよい】