"A Tua Mãe" is a about 100x10^999 times more insulting than Gaylord. Unlike many other definitions claim, "A Tua Mãe" cannot be beaten by "fuck you" or any other insult.
Random Guy 1: Dude, you are a Gaylord!
Random Guy 2: "A Tua Mãe!"
Random Guy 1: Shit, I just got served