Wit
What is wit short for in text messages and online chat?
With
Example
"Are you bringing Gina wit you?"
"Yeah, I'ma pick her up on the way."
"Yeah, I'ma pick her up on the way."

An example of wit being used to mean "with" on Twitter
Related Slang
Usage
Last Updated: November 3, 2020
In text messages and online chat, wit is short for "with." If a friend tells you they want a "burger wit fries" or they can "get down wit that," they're using wit to mean "with."
Those who use wit in place of "with" are usually trying to sound dope or cool. Most often, people use wit when talking with someone they know, as it is a fairly informal abbreviation.