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1.
bar hopping. The source of the word comes from Thank God It's Friday, or TGIFing, when shortened in speech becomes jiffing.
What do you want to do on Friday afternoon? Let's go jiffing!
by ChronosFT December 05, 2008
 
2.
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!"
by Standon's fluffy bunny August 11, 2008