out of
outta
/ˈaʊɾə/ReductionT sounds
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Billy Ocean — Get Outta My Dreams, Get Into My Car (official audio) · YouTube ↗

1:11.91:17.8
What happens to the sounds
of becomes /ə/, the f disappears, and the t between vowels is a quick “d”: out of → “OUT-ta”.
When to use it
Get outta here! (surprise or disbelief), I'm outta time. In writing — only informal texts.
Casual → formal
Slang
outta
Neutral
out of
Sound notes
Reduction: unstressed words get squeezed, and their vowels turn into the neutral sound /ə/.