Mamón
This is a kind a asshole in spanish that you should already know is translated with cabron (billygoat) this is more in the sucking way...as the verb mamar means suck possible origin of define a person that is still breastfeeding.
Someone you can deceive very easily.
Phonetic pronunciation: [maˈmon]
English: idiot, man-child
German: Dummkopf
Catalan: babau
Italian: coglionazzo, mammone exist in italian and is similar but is spanish his meaning is much offensive. Muttersönschen, mama’s boy etc etc
Portuguese: idiota