"You canker blossom!" 3 Shakespearean Insults
the surname apparently is from Old English *prætt (adj.) "cunning, astute;" related to late Old English noun prætt "a trick" (see pretty). As a type of pottery, named for Staffordshire pottery manufacturer Felix Pratt (1780-1859).
The buttocks; ass: He does not fall on his prat
[1567+; origin unknown]