Caer gordo, “to fall fat,” means to be disliked. The Diccionario del español de México gives the example “Me cae gordo por presumido y desdeñoso” (He falls fat on me because he is boastful and disdainful).
Sangrón is a person who behaves unpleasantly, the dictionary says, “sin deseo de agradar, o sosteniendo una actitud formal cuando no hace falta” (without wishing to please, or keeping a formal manner when it is not needed).
Onda, “wave,” also means a way of acting. The dictionary’s example reads: “Esa maestra es muy buena onda” (That teacher is very good wave).