17ing

1 in every 17 jokes an individual tells is funny. When they tell that seventeenth joke, they are "seventeening" or "17ing."

"Mark is seventeening!"
"Ha, that's actually funny. They're 17ing."

17ing

The act of a female entity leaning at a perpendicular angle over a flat surface, therefore exposing both the breasts (when wearing a loose shirt) as well as a clear view of the contour of the buttocks.

While wearing loose clothes, Anna greatly excited the group of boys she was talking to when leaning over the table. She was unaware that she had been 17ing, and tits were shown.