Star Wars Episode 1: The Phantom Menace - Jar Jar God English Dosen't Come Out Right.
Go to the part were Padme is cleaning R2-D2, and Jar Jar is coming in the room. When Jar Jar is saying " Whosa are yousa?", look at his lips, if you know how to read lips you can see it clearly, he is really saying "who are you?" and dosen't add his slang.
Actually, BOB, if you look in the mirror and say "Whosa are yousa", you'll note that you lips do not move. It's just your tongue moving slightly to let the air through. Perhaps it wasn't a mistake at all.
"Slang?!" You think Jar Jar talks like that because he thinks it sounds cool?! All Gungans used to speak "Gungese" or whatever they called it, but they eventually learned Basic, although "Gungese" was so different, they speak "Pidgin English". No. "Pidgin Basic". No. "Mynock Basic." No. Never mind.
Jar Jar could quite logically think it sounds cool to use "-sa" and the various other affixations that he uses, since we don't know what Gungans think is "cool".
btw: What did the Gungans call their language, anyway?