People who police other people's tweets for the sole purpose of making fun of typos and bad grammar.
I misspelled hypocrite on twitter and got a nasty message from some asshole twammar.
Twitter Grammar. A portmanteau of the words "Twitter" and "Grammar." E.G. using the word Tweeting instead of Twittering.
I'm Twittering about how I'm an ignorant shit with poor Twammar.