It means "to get angry". I have never heard anyone use it for something else.
"To get bored" would be "aburrirse", so I guess your Mexican friend is wrong (although I'm from Colombia so I am not 100% if they use it differently in Mexico). Anyway, in any standardized Spanish it would mean to get angry.
I'm a native speaker and a community tutor so if you have doubts or need help with something else do not hesitate to contact me :)