'Furry' is a verbal cue to change the direction in which you are facing by 180°. Then, you begin running in a straight line as fast as you can.

"Hi I'm Libby, I'd like to learn more about your culture. Would you like to get a coffee and chat with me?" Your question seems self-explanatory so I'm not sure what you mean.

I can't think of a sentence where 'only can' makes sense by itself. If there's a word between 'only' and 'can', then it might make sense. For example... Jeff: "Can Jim speak Spanish?" Bill: "No, Maria is the ONLY person who CAN speak Spanish. Jim CAN ONLY speak English."

21?!...

My step dad refrigerates his bread for some reason. Even though it makes the bread go stale faster... :/

'Killer' is an informal way to emphasize something, typically with younger age groups. In this context, a 'killer test' would mean 'a very difficult test', however if your friend just had a 'killer party' or did a 'killer keg-flip', that would mean or was a 'great/awesome party' or a 'great/awesome keg-flip'

People just use the word test, emarbe, there isn't a more specific word or phrase. Example: Customer: "Excuse me, can I take this motorcycle/motorbike for a test ride?" Shop Clerk: "Of course! Let me just get it ready for you." If you're talking about cars instead of bikes or motorbikes, people will ask to take a car for a 'test drive' instead of 'test ride'