Silly Leachy, if you plant budgie seed, you'll get budgies!
No, really, you might get something, but it won't be cannabis and it won't be lawn grass either. The box of seed might tell you what plants the seeds are from. Wild birds are often fed black thistle and millet and sunflowers, but I don't know about budgies.
If you want to grow lawn grass, you'll have to buy lawn grass seed at a garden shop or maybe a hardware store. The bag or box will tell you how much ground it will cover. You can choose seed for sun, shade or a mix.