Green’s Dictionary of Slang

retweet! excl.

[Twitter use: retweet is to copy a tweet to one’s circle of followers]

(US campus) an excl. of agreement.

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[US]C. Eble UNC-CH Campus Sl. Spring 2014 12: RETWEET — I agree: X: ‘I don’t get these people—why don’t they just keep to their own business?’ Y: ‘Retweet!’.