Yeah, it means the same as in non trans context. A trigger may make something or someone go off.
There are some people here, who really struggle coping with the topics of rape and violence in particular. Women are more vulnerable to such abuse, and often enough, trans women are no exception, in fact trans women are more likely than women in general to be in such a situation. Trans minorities have the most depressing statistics.
I know, I have been beaten to a pulp, had one ankle sprained and the other heel fractured just for coming out to the wrong person, and I am a lesbian, I was no threat to his sexuality or his masculinity. Also, like many other women, I did not report him to the authorities for fear it would make things worse.
Talking about it now, is no problem to me. Neither is reading about others. I can understand why it triggers people though.