Hi, Delirious!
When one has a very good spot in hide and seek; saying hello and goodbye to the seeker as they enter and exit the room you're located in to taunt them.
Delirious (Seeking): *Walks into room where Marcel is hiding under a tube as a scrap of paper*
Marcel: Hi, Delirious!
*Delirious walks out*
Marcel: Bye, Delirious!
Delirious: WHAT THE FUCK!!!!
Marcel: Hi, Delirious!
*Delirious walks out*
Marcel: Bye, Delirious!
Delirious: WHAT THE FUCK!!!!