According to the Merriam-Webster Online Dictionary the verb, glass, means to encase in glass. Recently, it has also come to mean being attacked or assaulted by a glass vessel/container as in this example:
Another glassing incident... A young woman faces assault charges after allegedly glassing a man in a Brisbane bar early today.
Similar incidents have been reported with a coffee cup, as in this example:
bizarre coffee cup attack between two elderly men over a woman. ...It is understood the younger man was hit over the head with a coffee cup in a popular town centre pub and was also scalded by a hot drink on Saturday morning.
Would this still be considered a glassing incident, or would it be considered (and I am not trying to be funny here) a mugging or mugging incident?