A Britni is someone who is amazingly beautiful and can be very sweet when she wants to be. You have to watch your back because Britnis are often very two-faced. They will be all kinds of fake (sweet, loving) to your face but make one wrong move and they will be on you like a spider monkey. Britnis are super sensitive and don't think twice before they act. No matter how beautiful they are and how sweet they can be at times, they are very unpredictable and to date/be friends with a Britni, you have to be sure you are on your guard.