Although the highest division in one of the most prestigious Counter-Strike (first-person shooter) leagues, cal-i has developed the title of a virtuoso in any activity. Whether it be in Counter-Strike itself, basketball, or even cooking. Referring somebody or something to cal-i is very similar to expressing one's ingenuity.
"Oh wow your mom's cooking is cal-i."
"Ugh. That beat is cal-i."
"Game winner? OMG you are cal-i"