free of charge, compliments of the owner
Bartender: "I think you are really cute, so I will give you drinks all night on the house."
Lil Shorty: (blushes)"Thank you!" (as she leaves to dance with her boyfriend)
free of charge (often applied to food or drinks)
Have another beer, on the house.
When an object is given to you and paid for by the person giving it to you.
Because you are sexy, this drink is on the house.