also: ビヤマグ
noun
beer mug
A large, sturdy glass or ceramic mug specifically for drinking beer. Common in izakaya and beer halls.
冷えたビアマグでビールを飲むと美味しい。
Beer tastes great when you drink it from a chilled beer mug.
店員が大きなビアマグをテーブルに置いた。
The waiter placed a large beer mug on the table.
ジョッキ is a more general term for a beer mug or tankard, often with a handle, while ビアマグ specifically emphasizes a mug for beer, sometimes without a handle.
グラス is a generic glass, while ビアマグ is a specific type of glass or mug for beer.
Wasei-eigo from English 'beer' + 'mug'.