Acronym for “Fuck Around And Find Out”. Usually reserved for those people who want to keep pushing a situation until they indeed find out how badly the other person is going to react and open a can of whoop ass on them.

n. The birth name of somebody who has changed their name. Most commonly attributed to trans people, but can be attributed to any person who has changed their name. (sometimes written as two words: dead name)

v. 1. To call somebody by their deadname.
v. 2. To out somebody's deadname to the public.

FAAFO/FAFO Means, Fuck around and find out. Typically worn, flown, worn and genuinely just stated by libertarians and Boog Bois to warn and ward off personal attacks or threats regarded to the person using or stating FAAFO/FAFO.