Innit is short for 'isn't it', and you stick it on the end of a sentence to get someone to agree or just to add emphasis. It works after pretty much anything, not only 'is' sentences.
Short for 'devastated', but people almost always use it jokingly about something small that let them down. You're not actually heartbroken, just a bit bummed.
The café ran out of banana bread before I got there, I'm devo.
Someone who's lazy and dodges work or effort, often leaving others to pick up the slack. A 'dole bludger' is someone people reckon is living off welfare without trying to get a job.
Get off the couch and help with the dishes, you bludger.
Someone seen as rough around the edges and unsophisticated, kind of like a British chav or an American redneck. It can be a put-down, but plenty of people use it fondly or even call themselves one.
Mullet, flanno and a ute with a massive sound system, he's a proper bogan.
It's when something is really nice, pretty, or you just love it. You use it for things that look good, are well made, or that you have a great time with.
Qué chido estuvo el concierto de anoche, ¡hay que repetirlo!
How "chido" last night's concert was, we have to do it again!