What is Tweetup?
1.
An organized or impromptu gathering of people that use Twitter. (A meet up of people that 'tweet' using Twitter.)
Are you going to the "tweetup" tonight?
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2.
A gathering of nerds attempting social contact, likely for the first time. Usually disintegrates into everyone running to the nearest computer to type to one another.
Tommy: Hey Jethro, quit playing WoW its time to meet some folks at the tweetup!
Jethro: Oh yeah I forgot about that, I can't wait to meet BigBootay421 at the tweetup, but first I need to slay this orc!
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3.
A group of friends on Twitter (social network) that are planning to meet up. A request by a user to meet with friends via Twitter.
Hey @user1 and @user2, u guys wanna tweetup at the Nickelback concert at Mariner?
See