What is the meaning of "had a fit"? Is it something like very angry or pissed off?

Rebecca

When a baby has a "fit", it means that they begin to cry and scream very loudly. But you are also correct, "having a fit" can also be used to refer to someone getting very angry and upset over something. So in this case, the meaning of "had a fit" applies to both of these, since he is very angry at first but then starts having a fit like a baby.