tumblrbum 

Someone who devotes all their free time to Tumblr.

Frequently browsing tags related to their desires, and never pursuing them.

Janet: She spends all day on tumblr looking at fitness posts, talking about all the weight she's going to lose. But she hasn't exercised in 3 weeks!

John: Yeah she's a total tumblrbum

tumblrbum by weedlord360 January 16, 2016

tumblrculosis

A disease which causes one to spend all of their free time on tumblr. Symptoms include fever, starvation, extreme feels, and eyestrain.

Andrew suffers from a severe case of tumblrculosis. He spends hours per day on the site and never does any of his classwork.

tumblrculosis by TimeBaum February 11, 2013

Tumblrism 

A bastard deviant child of Socialism and Self-Victimization where one claims they support the building of a socialist state, without providing the means of doing so. A substantial amount of the ideas used to support Tumblrism were conceived during collective conversations on Tumblr (particularly Tumblr safespace).

Guy 1: Did you see that facebook post about Bernie Sanders that Tiffany posted?
Guy 2: Yeah, total trash dude. Tumblrism is a cancer.

Tumblrism by cammy cam cam May 16, 2016

Tumblrism 

A form of escapism from reality by using Tumblr all day and night.

Sorry to say this, but you show some serious tumblrism symptoms. We shall make everything in our powers to find a cure.

Tumblrism by Poble March 28, 2013

Tumblrfucking

When two or more Tumblr users with blogs of primarily erotic content are liking & reblogging each other's content in real time, meaning all parties are online at the same time, leading to mutual sexual arousal.

"Man, I was browsing through this hot lady's blog of sexy stuff last night, and the next thing I know, we were Tumblrfucking for about an hour or so. "

Tumblrfucking by Averagejoe316 September 28, 2018

TumblrTime 

The amount of time that seems to have passed while on Tumblr, compared to the amount of time that has actually passed. Such as going on at 3 o'clock for only 5 minutes, then looking at the clock and seeing that it is now 6 o'clock. What it feels like to be on Tumblr.

If only being at school felt like TumblrTime, I'd finish all my classes in an instant!

TumblrTime by edgesofedict May 29, 2013

Tumblrism 

When somebody is addicted to Tumblr. Meow. The thought that your life wouldn't be right without it.

Mum: Get off the computer! I bet you're on Tumblr again!
Me: Mum you know I have Tumblrism, going cold turkey would take into withdrawal!

Tumblrism by Voldemortkilledme! August 2, 2012