(not to be overused)
the international sign is represented by taking your pointer finger and thumb and smashing them together.
Sam: Ference bro.
Look at that reference, it's like that guy totally witnessed a ference, then made note of it at a later point in time, one or more times, much to the chagrin of his compatriots. He must have a huge dick or something.
I'm going to a conference, at which me and several other corporate d-bags will make note of various ferences in a boring, unpleasant way, most likely with an abundance of less-than-desirable snacks such as small, overly-salted packets of pretzels, and far too many small, individually-packaged mints.