The Collaborative International Dictionary of English v.0.48:
Corkage \Cork"age\ (-[asl]j), n. The charge made by innkeepers for drawing the cork and taking care of bottles of wine bought elsewhere by a guest. [1913 Webster]WordNet (r) 3.0 (2006):
corkage n 1: a charge added at a restaurant for every bottle of wine served that was not bought on the premises