MostestBestest

A Topping "Extra Extra" on Expression added to conversation or writing about something you do or made or about someone elses actions, and may be chained further i.e. GrestestBestestMostest (Also a form of playful one upping eachother back & forth )

" I made the MostestBestest sandwich ever!"

Person¹: I like you

Person²: I like you MostestBestest
Person¹: I like you Greatest MostestBestest