1. Staring at someone in a manner that indicates a sexual interest.
2. Looking at someone to the point at which they are being undressed in one's mind.
"My teammates and I totally got retina raped at the truck stop last night."
"Don't look, but that creepy guy is so retina raping you."
When you are blinded by the flash from a camera against your will, i.e. at a bar when someone at another table has a camera and you get blinded by it.
Oh man, I can't see anything, I just got retina raped by that bachelorette party over there!