Coaster Dome
The act of giving/getting head while riding a roller coaster. The roller coaster can be of any given size, thrill, or style.
Joe: Wow, that's a big roller coaster! That must have been a fun ride.
Moe: Yep! It was even better because I got coaster dome from Zoe
Moe: Yep! It was even better because I got coaster dome from Zoe