Got, Got To, Gotta (By Paul Selcke)
0:34 -- have got = have
1:27 -- have got to = gotta
3:05 -- example sentences
At the end of the video, he writes that “gotta is not a real word.” What he means is that this is a word that is not used in formal writing. You will see it in comic books. You will hear it in everyday conversation.