The full form of DYI is Doing Yourself
DYI stands for “Doing Yourself In”. In this context, and not the context of the very similar DIY, the slang word is used as a warning that actions have consequences. Example would be saying that having too many drinks at a bar will cause someone to do themselves in; that is get in trouble or do something they will regret.

Origin of DYI

The likely origin of DYI is the early 2000s and with text messaging. While there is some debate if the first DYI was a misspelling of DIY, the slang stuck around regardless. By the mid-2000s its usage began to seep online on both message boards and forums before seeing usage on social media platforms such as Facebook and Twitter. Given that “doing yourself in” is something that can happen to anyone for a variety of reasons, this slang is likely to stick around.

Other Meanings
There are no other recorded meanings of this slang.

Conversation Examples
Text Between Friends

Friend 1: “Hey, you up for the bar tonight?”
Friend 2: “Maybe. Would we have a designated driver?”
Friend 1: “Designated driver? Nah! We don’t need that!”
Friend 2: “I don’t know. My limit is about two drinks and I know you DYI at about three.”
Friend 1: “If you’re so worried we’ll just call an Uber.”
Friend 2: “I’d like that.”