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People who tweet someone else'e tweet as their own instead of re-tweeting them.
Original finder of a funny article is ABC, while XYZ follows ABC.

ABC: This is funny. lol someFunnyUrl

XYZ who follows ABC tweets receives this tweet and tweets it as his/her own instead of doing RT @ABC: This is funny. lol someFunnyUrl

Thus, XYZ is a twitter leech, aka a tweech.
by linkkhi June 19, 2009
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