Wow, so many noobs in this thread haha. Not all of you, but damn there are a lot. Let me clarify:
Chronic:
Weed laced with coke. Your buddy isn't getting you fucking chronic,
champion. A lot of people have taken up calling good weed "chronic",
but they're wrong. It's also not a strain, not sure where that idea
came from.
Headies: A general term for good weed, however it really should refer to sativa strains only.
Middies: Shitty weed. Have fun trying to sell it anywhere they get decent bud. Have fun coughing up a lung because it's harsh as shit and still barely getting high.
If you aren't getting it from a grower or the next step down in the hierarchy below the grower, then strains are bullshit. People will say anything to move their shit. Look for crystals. Not red hairs, or anything stupid like that, just crystals. Crystals = THC. Leafy bud just means the grower didn't prune his shit, kind of annoying but whatever. Seeds and stems are annoying but ultimately weigh jack shit, so aside from being a pain in the ass to sift through, they too mean nothing. That being said, you tend to only find a lot of seeds in outdoor which tends to be noticeably worse than indoor. Now you can go forth into the misdemeanor black market and not get ripped off like the dumbass you were.