Rock climbing jargon for anything (particularly a rock climbing route) that requires significant flexibility and strength in the shoulders. Typically, routes that involve mantling (see the rock climbing move mantle) and stemming can be described as shouldery. In addition, any oddly positioned route that comes from under a shelf and requires torquing the body into an unusual position that rotates the shoulder in unnatural ways.
That 5.11b at Castle Rock is a shouldery route with a lot of hand-foot matches and mantle moves.
A top that shows and puts emphasis on showing off bare shoulders.
Shae's top was a bit too shouldery and causing a huge scandal by revealing her shoulders.