you already answered your doubt, once you'd said :"Mas ouço em muitos dialogos pessoas usando ele no sentido de MEIO".
These constructions you've brought up as examples are correct.
And you can also get something like: "kind of like", "sort of", and some further expressions
You can get that people call slang, or contractions (I'm not sure of which is the best adjective), e.g.:
"kinda", "kinda like", "sorta"...