Dillytek

Originating from Sydney Australia, the word became commonly used when Hardstyle producers, Aaron Tilse and Aaron Grace, formed a duo named Dillytek
The pair were from an area called Wollondilly, south of Sydney and is not exactly known for its low crime rate.

After a home invasion at one of the pair's house, the would be robber was bashed and his wallet acquired by the pair. The pair knew he would need to go to the hospital and wouldn't give out much information about how he sustained his injuries.

In that time the boys used the details in his wallet to go and trash the robbers house and write all over the walls of his home "You've been dillyteked"
So a dillytek is where a person committing a crime has the same crime reverse back onto them.
The pair later changed the spelling for their duo