Did you possibly mean one of these? Salish, impish, simplist, stylish
Definitions
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Examples
“I find the Sims just as constrictive as any other game, and loath their little "simlish" language...after a while all your sim seems to do is piss themselves and lie on the floor in a fetal ball.”
“From the moment you dive in you're greeted by more pastel-coloured shirts, opiate-addict smiles and engineered, adorable 'simlish' than you can shake neon green plumbob at.”
“The song "Now It's Dark" was also converted into simlish on the metal radio station for The Sims PC game.”
“There are a few basic tunes and sound effects, simlish voiceovers from your commanding officer and while it isn't anything exceptional to it, it's all in the right place.”
“Leggy singer Pixie Lott duets with herself in English and simlish”
“Animations, colours, and sounds all feel traditionally sims-ish, and the return of the simlish language itself continues to sound far too much like Danish to be a mere coincidence.”
“Because an all simlish movie would be funny, but you’d basically only know what they meant by gestures and the thought bubbles.”
EXTRALIFE – By Scott Johnson - The Sims Coming to the Big Screen
Lists
These user-created lists contain the word ‘simlish’.
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Ready, set, guess this language...
Maly i mala hulali po polu i pili kakao.
erewhonian, betazoid, rohirric, vogon love poetry, enochian, ewokian, polish, wakese, glossolalia, maledicta, freedomese, igpay atinlay and 19 more...
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easy peace
abide, showaff, sentense, shy, ex que, do more, i know everything, he knows everything, consistency, waking up curiousity, im starting to so..., now is the time t... and 17 more...
Tweets
Looking for tweets for simlish.

vanishedone Apparently this might have been a Navajo derivative, but ended up being made a form of gibberish. Jan 25, 2009