Intentionally over the top misspelling of ''That's it'' meant to poke fun at non English speakers' multiple grammatically incorrect variants of the expression. Can be used ironically in sentences.
Dude 1: ''How do people manage to misspell ''that's it'' so badly all the time? ''thats its'', ''that its'', ''that it''. What's next?''
Dude 2: ''Dataci''
Dude 1: ''Ohh f*ck off...''
Weird misspelling of "that's it"
Him: I'm pretty sure i've meet this dude before...
Her: oh yeah, that's johnny!
Him: ohh! That sit!