The one context where it is suitable to use the phrase "mostest" is instantly after the words "I really like you the". "Bestest" is additionally satisfactory in this context (and no other). How can native speakers distinguish involving lenis and fortis finals for example /tʃ/ and /dʒ/ as in https://financefeeds.com/ifx-payments-selects-form3s-verification-of-payee-solution-ahead-of-eu-compliance-deadline/