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Like its predecessors agar.io and slither.io, diep.io is a minimalist 2-D MMO game where you level up by first consuming things scattered around the map, then other players whom you think you can take on. Except this time, instead of controlling cells or snakes, you control tank (or more precisely, circles with shooty squares attached to them). There is a whole tree of tank types you can level up to have, as well as specific aspects of your tank (bullet penetration, speed, health regen, etc.) you can level up.

Like its predecessors, Diep.io addictive as fuck. It has 4 game modes, 3 more than either other game.
Student: "Dude, I just got a score of 250,000 while playing the Booster class in Diep.io"
Teacher: "This is why you failed the last project, Atkins."
diep.io by SMLJRON July 11, 2016
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a game played by an individual by the name of "Diepmaster"
Guy 1: Yo did you see him playing diep.io?
Guy 2: Yeah he was right after he ate his burnt quesadillas.
diep.io by seeligfamm December 4, 2017
Diep.io is a game about tanks and evolution,Team games to domination
Guy 1:Dude i thought maybe we could play some Diep.io today.
Guy 2:Sure Man
DIEP.IO by Om3gaWallflez May 31, 2018
A webbrowser pc / mobile app 2D shooter game
i got a hunt in diep.io
how much score did he have?
1.7m
diep.io by EclipSyS April 30, 2025
diep io is a game
Diep io by Table 278 YT January 28, 2023

One shot in diep.io 

Killing someone with one shot when they are at full health
The one shot in diep.io was OP

flophouse 

Any house/apartment/frat house/trailer/etc. which is used for individuals to crash (sleep, chill, hang out, lurk, etc.) for a period of time. In order to "crash", one must not actually live there (e.g. have their name on the lease, own said flophouse, etc.). Flophouses are typically used by college students, drug addicts, transients, vagrants, or other unsavory characters.

A flophouse may also be the home owned by the parents of a college student, who after being away at college, wishes to live as if he/she is still at college (e.g. staying out all night, returning just to crash at mom and dad's house, then leaving again), rather than conforming to the pre-college rules.
Example #1
Dude: (Talking to someone passed out face first on the floor of his college apartment) Hey man, who the hell are you? What do you think this is, a flophouse??

Bro: Sorry dude, I must have passed out for a minute.

Example #2
Mom: Where have you BEEN for the last three days? You come home just to sleep?? What do you think this is, a flophouse??!!

Son: What's your problem? I'm an adult now!
flophouse by J3553 November 21, 2007
Word of the Day on July 27, 2026