"Do it yourself" is the method of building, modifying, or repairing things by oneself without the direct aid of professionals or certified experts.

Do-it-yourself DIY meaning?

Obviously "do it yourself" — but is that all? ... Basically, DIY means that, instead of hiring a professional to do a particular task — or, instead of buying goods from a store or an artisan — you're choosing to do that task or create those products yourself with no direct help from an expert.

What else could DIY stand for?

abbreviation for do-it-yourself: the activity of decorating or repairing your home, or making things for your home yourself, rather than paying someone else to do it for you: a DIY enthusiast. a DIY project.