According to Georgia's GlossaryEdit

Quite literally, "Do It Yourself!" Rude when you think about it. Instead of getting someone competent to do things around the house (you know, like a trained electrician or a builder or a plumber), some vatis choose to do DIY. Always with disastrous results. (For example, my bedroom ceiling has footprints in it because my vati decided he would go up on the roof and replace a few tiles. Hopeless.)