One of the 26 most important things learnt at ages 0-3, and unless you work in a call center you wont think of itmore 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.