Top Definition
One who reblogs (jacks) multiple posts at a time from one person's tumblr.
A: Dude, what's the deal with SpeedRacerNoChaser? It's like the exact same blog as that GetDownLikeThis guy.

B: I don't know man. He doesn't have an original thought I guess. Dude is a straight up tumbljackr.
by Californianonfox December 04, 2011
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