A tumblr gf is a female you've never met with an attractive blog. A link to your tumblr gf's blog is featured on your main page menu links. You promote each other and are super cute.
"-About me
-If you're feeling down

-tumblr gf"
by itsokaykid November 10, 2014
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girls who try too hard to look either rich, grunge, smart, or better than you
Luke: Look at those wanna-be tumblr girls
Michael: Yeah, they look like idiots.
Ashton: Just look at their band shirts. I bet they don't even know one song by Nirvana other than "Smells Like Teen Spirit"
by kaelynnorm June 13, 2015
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That one period of time, (usually around 4-5 hours) in the day when almost all of the people you follow on Tumblr are active.
After the Tumblr Time Zone passed, it got really boring, with no one active and posting.
by UltramanVectis April 19, 2015
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Someone who spends time on tumblr getting triggered at peoples opinion.

They are usually very full of themselves and think their opinion is a fact so anything else is discriminatory or a personal attack
Did you see Rachel she’s become such a triggered tumblr user
by I fucking hate humanity April 16, 2019
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Tumblr Down Syndrome occurs when "edgy" teenage attention whores spend all their spare time on Tumblr.

Symptoms include:
1Feminazism
2Cutting ones own wrists in attempt to appear "edgy"
3Hating on cis white males
4Believing "cis" is an insult
5Writing shitty poetry

ie:

Roses are red,

Violets are blue,

I want to kill myself.

6Listening to "obscure" bands such as mcr an 5sos
7Hating on one for having an opinion
8Creating cringey/cancerous fandoms
9Spewing bullshit via keyboard
10Pretending to be LGBT to appear "cooler"
Guy1: Hey ,You talk to that semi-gorgeous chick over there?
Guy2: Yeah, but it turns out she's got Tumblr Down Syndrome, you'll never get her.
by Ni11ioN June 10, 2016
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The 1st Rule Of Tumblr Is, Your Facebook Friends Should Never Know About Your Tumblr
Person A: "Dude My Fb Friends Keep Postin Dumb Shit All Over My Dashboard."
Person B: "Dude, 1st Rule Of Tumblr"
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something that a perky white bitch might say when she sees a picture that you took that's artsy/cute, or you might wear a cute outfit and she'll say you're super tumblr, the possibilites are endless, unfortunately
annoying white bitch: oh my god gurl you're so tumblr i can't even.
by kitkatkattina June 30, 2016
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