Ding is often used as a replacement for saying "That's what she said." It originated from a person ringing a bell whenever such a statement was necessary.
When talking about a test...
"Man, that was hard!" -Person 1 "*Ding*!" -Person 2
When talking about a hotel room card...
"Put it in and pull it out quickly."
"*Ding*!"
1. exclamation used by noobs on an mmorpg when they level-up most commonly used in World of Warcraft.
2. Reference to the sound made by speakers in World of Warcraft when you gain a new level and out of the speakers comes an odd sound 3. less common, sound a church bell makes (seriously wtf who actually sees a church bell anymore
Bill {General 2.}: DING!!!
ted {General 2.}: noob...
{Bill has signed off.}
ted {Geberal 2.}: noob...