Quadrangle

[Sarah]

A plane figure having four angles, and consequently four sides;any figure having four angles.

[Sarah]

Quadrangle is an aggressive sexual act whereby the catcher is so viciously dominated by the pitcher, they are forced to walk home in the star-fished position or the quadrangle with arms and legs extended obliquely.

[Sarah]

A love triangle involving four people instead of three.

[PussyCat]

a flat shape with four straight sides:

[Kai]

A four-sided plane figure, especially a square or rectangle.