Robux

A ROBLOX in-game currency that is used to buy items off the avatar shop, get game passes, upload annoying advertisements, the avatar shop allows you to buy items or clothes that customize your character which is overrated in the ROBLOX community,

Person 1: "I just stole my mum's credit card to buy Robux!"
Person 2: "That's so cool! We'll finally get a Roblox girlfriend after looking so rich."

Kalb

A compliment in Arabic that means beautiful or a person who's in good behaviour, parents usually use it to express their feelings towards their children as a reward for doing something good. It's usually paired with the word 'ya' which basically calls out for a person or brings another person's attention.

Also paired with "Ya ebn el kalb" which basically translates to "Your son is so beautiful!" or "My son is so beautiful."

Parent: "Ya ebn el kalb!"
Son: "Thank you."