A nerd way of succinctly ending a rant typically on an internet blog or message board. By invoking a semblance of programming code, the nerd hopes to appease fellow nerds with a chuckle, while also disarming readers with a framing device to lesson the impact of their prior inflammatory words.
..so that's why george lucas having kids ruined the entire star wars franchise for the rest of us. /rant.
Pronounced "end rant." Reminiscent of various programming-esque chat-specific commands. Used when you've written a long rant and need some mental closure to assure yourself that you have indeed finished your rant, so that you can move on. Also serves as a signal to the reader that 1) the above text was in fact a rant and, therefore, has an underlying message that should be divorced from the passion and emotion that inevitably gave said text a mildly offensive or belligerent tinge; and 2) (especially during a lengthy back-and-forth) you do not intend to respond to any additional replies with a similarly equally long rant, because you've said your piece.
Less emotional versions could include "/end" or "/fin," especially for serving purpose 2).
Something that is said after a person has finished ranting (passionately complaining) about a subject which marks the end of the rant.
Person 1: I just really hate airplanes. They make so much noise, they waste so much energy and all for what? For just getting the rich and famous to where they need to be while us normies have to use the car to get around.
Person 2: ........
Person 1: Like, seriously, the world revolves around people who've got the moneyz, while if I want to get a flight to New York, I'll have to be crammed like a goddamn sardine because all the airplane companies care about is their profits.
Person 2: .......
Person 1: Rant over.
Person 2: Cool. So, wanna go to the beach?
Perosn 1: Heck yea!
When a person on twitter goes on a rant and in quick succession tweets whatever is bothering them and essentially creates their own personal tweet storm of rant, a rant-storm.