Definition of lotta from the Oxford Advanced American Dictionary

 

lotta

 
NAmE//ˈlɑt̮ə//
 
(also lotsa
NAmE//ˈlɑtsə//
 
)
(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 someone's speech.
See the Oxford Advanced Learner's Dictionary entry: lotta