merry drinker; person who gets cheerful when drinking
Describes someone whose mood becomes lively and happy after drinking alcohol. Often used in contrast with other 上戸 types like 泣き上戸 (crying drunk) or 笑い上戸 (laughing drunk).
He's a merry drinker; he always becomes cheerful when he drinks.
Merry drinkers liven up drinking parties.
A person who becomes tearful or sentimental when drinking, in contrast to the cheerful mood of 機嫌上戸.
A person who laughs easily when drinking; similar to 機嫌上戸 but specifically emphasizes laughter rather than general good mood.
Compound of 機嫌 (mood) and 上戸 (drinker; originally a term for someone who can hold their liquor well). The exact historical derivation is uncertain, but the word describes a type of drinker based on their mood change.