Definition of lotta from the Oxford Advanced Learner's Dictionary

 

lotta

 
BrE BrE//ˈlɒtə//
 
; NAmE NAmE//ˈlɑːtə//
 
(also lotsa
BrE BrE//ˈlɒtsə//
 
; NAmE NAmE//ˈlɑːtsə//
 
)
(informal, non-standard)
 
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a written form of ‘lot of’ or ‘lots of’ that shows how it sounds in informal speech We're gonna have a lotta fun. You should not write this form unless you are copying somebody’s speech.
See the Oxford Advanced American Dictionary entry: lotta