To identify those who you may suspect of having been Ting Ting'd or to inquire as to whether "Ting Ting" is present at your event, just exclaim, "Show me your ting ting!". If someone responds by showing the mark, you know Ting Ting is present. If a responder is possibly arrested for showing you a certain part of their anatomy, they were most likely mistaken and unaware as to what the Ting Ting you were referring to actually is.
"Yeah, he ting ting'd me last night? It was awesome"
"You two?! I also got a ting ting right here! Wasn't it the greatest night ever?!"
"Hey ladies! SHOW ME YOUR TING TING!!!"