English English? Or American English? An propper is not a word I learned in english.
English
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[quote]prop·er ˈpräpər/ adjective 1. truly what something is said or regarded to be; genuine. "she's never had a proper job" synonyms: real, genuine, actual, true, bona fide; informalkosher "he's not a proper scientist" antonyms: fake strictly so called; in its true form. "some of the dos and don'ts in espionage proper" BRITISHinformal used as an intensifier, often in derogatory contexts. "she looked like a proper harlot"[/quote] "Proper" is in fact a word.