The full form of WT is white trash.
What Does WT Mean?
The acronym “WT” is used on the internet to represent the phrase “white trash.” “White trash” is a derogatory term used to define poor white people, especially those that live in trailer parks and in the southern U.S.

Origin of WT
When the English first began to colonize the U.S., the city of London would send its unwanted white people to the new colonies there. These people were of Scottish, Irish and British descent and were sent to the New World as indentured servants before the time of using African Americans for such jobs. These people were known collectively as “waste people,” “squatters,” or “crackers.” The term “white trash” was first used to describe them in 1821 and by 1830 became the popular phrase used. It has been used popularly ever since then right up to the time of the popularity of the internet. This is why the acronym “WT” is used and it was shortened to this acronym to make it easier and more convenient to type when texting or typing online.

Other Meanings
There are some other meanings mentioned on the internet for the acronym “WT.” Some suggest that “WT” is an abbreviated form of the word “what.” Another suggests that the acronym “WT” represents the phrase “what the…” It can also be an abbreviation for the term “weight” and stand for many things in various fields of business like “without thinking, ” “walkie talkie, ” “working time, ” and “Wilms tumor.”

Example Conversations
A text discussion between two friends.

Friend 1: I can’t believe how WT Mandy can be sometimes!
Friend 2: Yeah, she can be kind of embarrassing at times. I guess I should have warned you about that.