when a guy gets a boner and his boxers stand out like a circus tent does becasue of the pole holding it up thru the center

When 4 people (guys or girls) tap it with 1 person in the middle. Similar to the Eiffel tower, but with a lot more people.

LARGE erection lifts pants to look like a Circus Tent.

When you give the person next to you at a pinic table a hand job. Picnic table cloths are usually red and white, giving the illusion of a circus tent. Judging by the movement of the tent you can tell how many rings it is.

To put the leg opening of your shorts over a person's head.

Breasts, tits

when a guy gets a boner and his pants stand out like a circus tent does becasue of your hands holding it up while doing a trick on your bicycle.