cakeage

cakeage

(ˈkeɪkɪdʒ)
n
a charge levied in a restaurant for serving cake (such as a birthday cake) brought in from outside the premises
[C21: modelled on corkage]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Most of my recent shows have lasted about three hours, just so I can get through most of the cakeage on show.
There is now a new charge in addition to service, cover and corkage - it is called "cakeage".
The cake was duly presented with four plates and forks but when the bill arrived there was a hand written charge of pounds 15 for "cakeage" on the pounds 129 total.