Definition of outta preposition from the Oxford Advanced Learner's Dictionary

 

outta

 preposition
(also outa)preposition
BrE BrE//ˈaʊtə//
 
; NAmE NAmE//ˈaʊtə//
 
 
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used for writing the way ‘out of’ is sometimes pronounced in informal speech I'm outta here! (= I'm leaving now.)
See the Oxford Advanced American Dictionary entry: outta