Sickballs is another form of saying 'awesome' or 'great' most
commonly used in slang conversations. It's main use is to signify
approval or to show appeal about the subject of the
conversation.
Person1: "
Hey man you've just been selected to get
kidnapped this
year!"
Person2: "That's sickballs!"
Person1: "Yeah that's sickballs fr fr."