pin-up noun 3pin up verb 1forms 4 noun3 •A photograph, printed in a magazine or other publication, of a sexually attractive person (often nude or provocatively dressed), and intended to be removed and pinned up on a wall.pin-ups on every wall of their dorm room •[before a noun] The person so depicted.Damn, she could be a pin-up, for real. •(informal, figurative) A figurehead, a person who represents an idea, cause, etc. pin up verb1 •To put (e.g. a sheet of paper) on display, using a pin. formspinned up · pinning up · pins up · pin-ups