cack /kak
/ British English informal ▸ noun [mass noun] 1 excrement; dung: cow cack.
2 rubbish: they talk such a load of cack.
▸ verb [with object] defecate in (one's clothes). – ORIGIN Old English (as cac- in cachūs ‘privy’); the verb dates from late Middle English and is related to Middle Dutch cacken; based on Latin cacare ‘defecate’.