In The Book of Boba Fett's Episode 4: The Gathering Storm, Boba and Fennec have this exchange:
Fennec: What's next for you?
Boba: I'm gonna find my armor. Then I'm gonna kill that bloated pig who double-crossed me. Take his throne.
Fennec: You wanna head a Gotra?
Boba: Why not?
I couldn't quite make sense of this, since presumably he's talking about
Bib Fortuna, but it's not clear how or whether Bib and Boba had interacted before then.
Throughout his appearance in Return of the Jedi, Boba is taking orders from Jabba, and only falls into the Sarlacc because of his own decision to fly into the fray and get whacked with a stick by Han.
Is this in reference to some event that has been shown, an event that hasn't yet been shown, or is it just Boba's opinionated view of the events of Return of the Jedi?