Omcfy stands for oh my coolfucking yeah. People use this combo when something very surpricing happens. This is a way of showing excitement for some good news or just casually being flattered by something.
"omcfy did he actually prepose to you?"
Oh my coolfucking yeah I cant belive that the new flavour came out today!"
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?"