The end of your life.
You can no longer post on Tumblr for the rest of the day/night and you have to wait till 12:00 to start posting again.
Tumblr Person 1: How come you're not posting anymore?
Tumblr Person 2: My life is over untill 12am... post limit ):
Tumblr's way of bringing out Satan.
hipster : im literally going to have a meltdown. i'm on post limit. ugh what even is life.