A religion, such as Christianity, that is practiced every holy day, involving all Halo 3Xbox Live subscribers. Holy Days are every night, from 6:00 PM-6:00 AM.
Person A: I celebrate Christianity, therefore my favorite day is December 25th.
Person B: Well I celebrate Halo Threetianity, and our holiday is September 25th.
The girl that is just everything u want. She has a beautiful face and mind even great personality. She is smart n funny,caring and sweet,energetic and cutee. She is talented. She can make the most boring situation into one of the best happiest moment in your life,filled with inside jokes and hyperness. The type of girl that you want to keep close and never let go. She's the type of girl you'd really want to spend the rest of your life of.
Three conjoined phalluses located in the pelvic cavity, directly above the the testes. Contrary to popular belief, there is no "factor tree", I.E. hydra rules do not apply.
Yo man, my bro johnny has the craziest threenis setup in his jeans. The ladies have to watch out for him.