Something odd people do which is replacing words with "ck" at the end with "cc"

White powder that makes you reach cloud nine(Cocaine)

'CC' or Double 'C'

Used by Crip Gang members to replace 'CK' in any word.
'CK' - Abbreviation for 'Crip Killer' a term used by rival gangs.

Crips may also add a silent 'K' after any 'B' to represent the expression 'BK' (Blood Killer), such as BKlood, or BKloCC

Common substitution of letters "ck" in Crip gang culture, due to "ck" being an acronym for Crip killer/killa or Crab killer, being its more extreme variation. For this reason, words that include the letters "ck" are either removed (deletion), avoided, or replaced by "cc". For example, the phrase "kick back" is written as "kicc bacc". There are instances of wandering tourists getting the stares or even being confronted by crip members for wearing Calvin Klein clothing line. This practice has found its way into the meme culture and popularised by memes such as "THICC".

CC letter substitution is now considered a mainstream practice. However, not many people know its exact origins.

It means your Credit Card.

whenever you want to make words that look funny by adding cc at the end.