What is the LGBTQ+ panic defense?

This shit was made literally over 100 years ago as "homosexual panic disorder"

The claim that someone murdering someone due to having different genitalia then they expected in bed is somehow self defense.

It's a trial defense. Basically saying that you reacted and harmed someone because you were so distraught over learning someone's LGBTQ status. Say you met and dated a post op trans woman and subsequently learned this information and murdered her. You could use that as a valid defense to either..