So in English, we often write things when we're mocking people, or just playing around, like saying "Haaaaaiiiiiii" instead of "Hey", or say things like "Wut's up" instead of What's up or "tyte" instead of tight. Such as replacing "i"s with "y"s. We also use numbers like saying SW33T, for instance or add "z"s to the end of words to make it plural instead of "s"s, and repeat letters in words to drag it out, such as "you guys are suuuch bitchezzzzzz" instead of "bitchessssss" and such. And for one last example, when people use things like "u" for you and "y" for "why" etc.
My question is, in other languages, do people do stuff like this, and if so, give some examples!
I've always wondered about this and now I hope to finally get an answer.