The
act of dressing oneself and an accomplice in
furry animal costumes and having them piss, shit & come on you. The soiled party is known as the "jiffee"; the soiler as the "jiffer".
As seen in "Stars Wars: The Return of the Jedi":
C-3PO - "They seem to regard me as some sort of...
god. It'd be
alright if I could only stop them jiffing all the
time, look there they all go again!"