what does "dime" and "nickel" mean?

[Who Dat]

Nice nugs bro my dealer hooks me up, of course I know the difference what do you think I'm new?

I thought you were because you didn't know what a nickel or dime was, but it looks like there are lots of different meanings... all I've ever heard referred to as a nick or dime is $5/$10 of schwag.. are Canadian weed prices really about half? Damn