For God's sake, every signature I look at has something to do with this, is it about a game or a cartoon? Is it some inside joke? Is this some pun or joke I don't know? PLEASE EXPLAIN TO ME!!!!!

A kumquat is some kind of tropical fruit I think.
The reason why a bunch of people talk about them on the forums is because @cheddargirl’s image host for her forum signature stopped working, so instead of fixing it she just said “my signature was eaten by an evil kumquat.” And then more people decided to put that on their signature and some people make these little guys out of scratchblocks to protect their signature from kumquats.

((^) _ (^))
((*) ~ (*))

(They usually look better but I’m bad at scratchblocks)

So it’s basically just an old joke on the forums.

what I if told you…
You read first the one wrong.
And that one ^
Goodbye Human
Unless
You aren’t a human?

This is kumquat:


EDIT (Just don't care): HOW IN THE WORLD I WAS LOGGED INTO MY MAIN, I WAS JUST IN MY ALT RIGHT NOW????!!!!

A kumquat is a fruit similar to an orange.
It has become a scratch meme. people often say that their siggy (signature) was eaten by an “evil kumquat”.

An evil kumquat is a fictional creature which is commonly said to eat forum signatures. In reality, it was a joke started by Scratch Team member cheddargirl.

In real life, kumquats are a fruit in the orange family native to China; today, they are grown worldwide.

The trend was started in the Scratch 2.0 Beta by the Scratch Team member cheddargirl, who discovered that the image host that held her signature, Imgur, was no longer supported. Instead of rebuilding her old signature, she changed her signature to the following:
Sadly, my signature was eaten by an evil kumquat.

The trend spread very quickly, and many signatures now mention kumquats.

This trend has also moved out of the forums to the Scratch Website, mostly in studios. Some Scratchers have created accounts called “EvilKumquat” or something similar. The accounts may also say “I ate cheddargirl's siggy” or something similar. Some even post on the forums with their accounts or ‘communicate’ with other kumquat accounts.

Some Scratchers also create “kumquat guards” with scratchblocks, usually in the form of reporter blocks with faces made from characters e.g

<〵^ o ^〴> // This is Kyle! he defends my signature from evil kumquats.

I hope that helps

^▽^ :: #ff00ff boolean // This is Scrunchie! She protects my siggy. 

Even i have one of these “kumquat guards”. (highlight +shift + down on my signature)

^▽^ :: #ff00ff boolean // This is Scrunchie! She protects my siggy. 

To keep it as short as I can, kumquats were made infamous in the Scratch community because cheddargirl's image hosting service she was using got unwhitelisted due to inappropiate images.

-TwentyFour- wrote:

This is kumquat:


EDIT (Just don't care): HOW IN THE WORLD I WAS LOGGED INTO MY MAIN, I WAS JUST IN MY ALT RIGHT NOW????!!!!

I'm from Brazil and from what I remember, this little fruit exists close to where I live.

this

tl;dr
a fruit from south east asia