This is commonly used in online games (such as Warcraft) by a player when something goes very badly or unlucky for that player.
Player A: T.T
Player B: Yeah, I can't believe you didn't see me.
Vul hier je e-mailadres in en ontvang elke ochtend gratis het Urban Word of the Day!
Je zal emails ontvangen van firstname.lastname@example.org. We zullen je niet spammen.