to remember someone you don't otherwise know when seeing a photo or hearing a description. one having boner memory will have their meories aided and enriched based on the fact that the subject of the memory gave them a sexual buzz.
Liz: Hey Casey I met a guy from your college on the net named Paul. Do you know him?
Casey: No. I don't think so.
Liz: Here's his photo. That's a guy I would definitely like to get in his funky undies!