Denver Balloon
The act of creeping up on your sleeping spouse, then spreading your ass-cheeks wide open and in one swift movement, locking your anus-lips to their mouth-lips and letting go with a bowel shattering fart, thus causing your spouse's cheeks to balloon out to full capacity for a split second or two.
dude, i gave my wife a sick Denver balloon last night. I laughed for hours.
Denver Hot Air Balloon
When you take a piece of chewing gum and blow a bubble inside your girl's love hole.
Frankie was chewing a piece of Big Red when he went down on his girl, so he decided to give her a Denver Hot Air Balloon.