paid drinking outing; getting paid to go out drinking
Modern slang for an arrangement where someone, often a woman, is paid a set fee (typically to cover taxi fare home) to accompany others drinking. Common in social media and dating-app contexts.
See also: ギャラ
She earns pocket money on weekends through paid drinking outings.
The going rate for paid drinking outings seems to be about the cost of a taxi ride home.
Compound of ギャラ (from English 'guarantee', meaning fee or payment) and 飲み (from 飲む, to drink). A relatively recent slang term.