3. "Swag." This one is used for a lot of things actually. "cool" and "awesome" yes. I generally hear it as being a shortened version of the word "Swagger." e.g. "Bruno Mars has some serious swag when he performs." (Sometimes, in this context it is also an acronym for "secretly we are gay.") It can also be acronyms for "stuff we all get" which is promotional items from businesses usually. "I got a lot of swag from the conference booths" "The radio station was giving away a ton of swag"
4. "Meanwhile in..." This is usually a joke about what is going on (at home or away) while someone is away. Let's say there is a big snowstorm happening at your house but your parents are on a tropical vacation. So after they find out about the storm they send you a picture of them on the sunny beach with the caption "Meanwhile in Fiji..." just to tease you that while you are in the snow, they are living it up in the sunshine. Or, perhaps your husband is at home with the kids on this particular day, and sends you a pic at work of your child sound asleep in the middle of a gigantic mess with the caption "Meanwhile in the [Jones] household..."
["Come to play"] they said, ["it'll be fun"] they said...This one I think is always said with a sarcastic tone. It's when things most definitely didn't go the way "they said" it would. (usually it has an aggravated tone, but whoever says it is not really irate either) So if you were talked into "coming to play" and promised that it would be fun, but you ended up vomiting in the hospital and needing a couple of stitches, you might say something like "'Come to play,' they said. 'It'll be fun,' they said..." or "'Just try it'" they said. 'It's not dangerous at all!' they said..."
I hope this helps. It is sometimes hard to explain without showing you a situation.