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1.
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.
by ReallySuperDuper August 25, 2009
 
2.
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.
by fair_claire April 29, 2010