One of the 26 most important things learnt at ages 0-3, and unless you work in a call center you wont think of it more than 15 times in the year, let alone say it
a is for apple c is for cat x is for... erm... xylaphone
Hairy xylaphone is something that a vagina does. Also known as a phanny fart, in which the vagina releases a smelly 'fish' like gas causing the room she is in to stink pretty badly.
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.