Noun: The sound an underside of a boot makes when it comes in contact with a chin. Usually used in comic book panels when the hero subdues a villain. THUKK!
one of tadashi yamaguchi's many phrases lovingly spoken to kei tsukishima, who he's definetely a LOT sus for.. š it means "i'm sorry, tsukki!" a common quote heard among haikyuu stans!
Note: Tsukkiyama is the haikyuu ship, but Tsukiyama (one "k"), is a weird ass french ghoul, who has some serious problems, from the manga and anime series Tokyo Ghoul.