The coolest way to speak of tumblr so nobody knows what you're really saying.

cuz we don't want it to be MAINSTREAM lolz.
by Erin Griddle February 21, 2011
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When a straight man "goes gay" for the first time. The first time he has gay sex. He is said to tumble. Used especially in the case of very macho tough guys.
I'm into chicks and all, but I would totally tumble for Justin Beiber.

We all knew Fred had a bi streak to him, but it wasn't until he met Joey that he finally tumbled.

If you are looking for first timers check out that gay bar on the edge of town. It is known to have a lot of tumblers hanging around.
by Mr. Bildo May 22, 2013
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The act of blogging or reblogging obsessively on the amazing site, Tumblr.
by Niyoboris1 October 16, 2011
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verb: fell, (her/him) had sex with, especially anywhere except in bed.
by JANICE ANNE LEE September 16, 2003
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To comprehend the meaning of another slang expression.
When he said "rat fink" I didn't tumble.
by Dan November 20, 2003
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When a girl or woman has spent way to many lonely nights on tumblr. Alone. And she has taken on tumblr as part of her personality.
Guy 1: Hey man look at that chick over there! She's got a mean case of the tumbles.

Guy 2: Hey chick come over here!

Chick: Oh my god guys, did you see that (insert band name here) in concert?! They are just sooo perf, I can't!!! asdfjkl!

Guy 2: Oh god...
by NelliyJuice December 7, 2012
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