As I understand it, this is a slang word in this context, and is used in this way when the speaker is impressed positively or negatively by something "That's some rain!" - about a heavy rain "That's some good stuff!" - about something very good "This is some vacation"/"Some vacation this is" - when a vacation is going extremely good or extremely bad. "Isn't she something?" - about an unusually smart, resourceful or otherwise impressive girl It is also used sarcastically, meaning the opposite. "Some gentleman he is" - when describing a person who claims to be a gentleman, but does something rude. I'm not a native speaker, but I hope this helps!

that's (a small amount of) candies (there should have been "candies" not candy) It is the most common using of Some. - can you give me some salt? - can I have some of this meat? - you have love: please give me some.