A poorly made up portmanteau word. It's made up from "twitter - party". A twarty usually needs a theme. It's where people, erm, "hang out" on twitter and tweet mostly about the said theme.

For one thing, you can tweet your questions and the twarty's host will answer them. The good thing is, it'a a lot harder to feel awkward in a twarty, and you can easily twarty hard.

However, the word twarty, is well and truely awkawrd and lame.

the thing that you don’t have when you’re phones percentage is over 20