a heavy glass with a handle and usually with patterns cut into its side, out of which you drink beer

We all raised our wine glasses and beer mugs to toast the happy couple.

There's a dusty old beer mug full of pennies on the shelf behind him.

They serve all their cold drinks in frosted beer mugs.

There were empty beer mugs on the table.

Someone had dropped a beer mug and there was glass all over the floor.

See also: mug noun (CUP)