Drink While Standing, Drinking While Standing
Noun
たちのみ
夏には、テラスせきで立ち飲みもできます。
In summer you can stand and drink on the terrace.
東京の新ばしえき近辺には立ち飲み屋がたくさんあります。
There are a lot of stand-and-drink bars near Shinbashi Station in Tokyo.
昨日、あの立ち飲み屋の後、誰かとやった？
Did you get any action last night after leaving the standing bar?
The meaning is the same as the kanji. When you stand and drink, you're probably at a stand and drink place.
The readings are from the words 立つ and 飲む put together.