First defined by Pythagorus to mean the number of togas in Ancient Greece, Fucktillion is now commonly used to represent a number one less than infinity.
Hyperbole used to express or describe a very large number, akin to words like bajillion.
Actual conversation:
Person 1: Yo, someone said the ratio of Spies to every other class in Tabula Rasa is Fuckbillion:1.
Person 2: Fuckbillion. That's a lot.
Verb: to accidentally dial someone with your cellphone by putting pressure on your phone during sex, causing the listener to hear the sounds of you having sex with someone. Happens when you leave your phone on the bed, or it falls out of your pocket and on to the backseat of a car, onto the couch, etc.
Fuckdialing example: "Me and this girl were banging on her couch and her knee ended up on top of her cellphone--she totally fuckdialed her mom. After we finished we suddenly heard this tiny voice saying 'Hello? Hello?' She was mortified."