A word very valuable in situations where you are playing Scrabble and wish to temporarily infuriate your opponent with your apprent complete disregard for the simple dictionary-based rules of the game, only to have them remark in your favour with a certain astonishment when they discover it really is a word.
"syzygy?! That's not a word!!"
"It is so! Go ahead look it up!"
"Alright..." (time passes as opponent flicks through the dictionary) "... God damnit..."
The near perfect linear alignment of 3 or more celestial bodies (as in the sun the moon and the earth during a solar eclipse) in a gravatational system.
A total-harmony state achieved by a group of meditation-minded "in tune with the power of the Universe" hippies while engaged in perfectly-in-sync cutting/trimming of paper/fabric with "syzzors".
Performing syzzygy with your weed-puffing buddies can indeed be relaxing, but your hands get tired fairly soon from all of that synchronized snippin'.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"