Cagtard is a term used to describe a person (usually in Roblox mil-sim RPing communities) that is way too obsessed with military accuracy and are a general annoyance to every fucking person.
Nerd: UHMMM AKSHUALLY THAT IS THE WRONGHELMET, THE USA SPECIAL FORCES DONT USE THAT!!!!
Normal person: What a fucking cagtard.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi