What does gay pressed ham mean?

When a person bares their buttocks, and presses it up against a glass surface to force the cheeks wider, displaying the anus as well.

Definition

Usually this occurs when those mooning, are in a car or bus, and place their bare buttocks up against the glass window. While it is a form of mooning, one who pries apart the ass cheeks, to expose the anus, could also be termed, pressing the ham.

About

See also Exhibitionism.