caddy　
cali 
captain obvious　
catch ya later　
catfish
celly 
cha-ching 
check it out 
cheers 【ベスト100スラング48位】
cheugy/cheug  [2021]
chi town 
chick 
chill out 
chuuch 
cig 
clapback
climb the wall
cold turkey 
Come again? [2021]
congrats
cool beans, kool beans　
crap 
cray / cray cray
crib 
cringe / cringe-worthy　
Cross that bridge when you come to it. [2021]
crunk