1. Someone who
literally CAN NOT survive without
getting on tumblr at least once a day.
2. Someone who thinks everyone will die in a horrible tragedy if they do not log on at least once a day to post indie pictures, emo quotes, and naked
Harry Potter pictures.
3. Generally, just someone who is fuckawesome.
1. Dude that guy is pelting the waitress with shrimp because she won't give him wi-fi access so he can get on tumblr. Total tumbladdict.
2. If I don't get on tumblr right this second, Y2K is going to occur
belatedly! No, I'm NOT a tumbladdict! I'm serious!
3. Guy: I have a tumblr.
Girl: Please
have sex with my vagina now,
you are a glorious tumbladdict please.