noun
Casual slang for drinking alcohol at home, often with friends, as opposed to going out to bars or restaurants. Compare 家飲み (いえのみ), which is a more general term.
See also: 家飲み
今夜は宅飲みしようよ。
Let's drink at home tonight.
宅飲みのほうが安くて気楽だ。
Drinking at home is cheaper and more relaxed.
家飲み is a broader term for drinking at home, while 宅飲み is more casual and slangy, often implying a gathering with friends.
Compound of 宅 (たく, 'home') and 飲み (のみ, 'drinking'), the continuative form of 飲む (のむ, 'to drink'). A relatively modern slang term.