The idea that you are entitled to having relations with a specific girl simply because your brother, cousin, best friend, co-worker, fraternity brother (or sorority sister, if that so happens to be your thing), or roommate hit it.
"His little brother in the fraternity called me 'cutey'"
"Why!?"
"I don't know! It was weird because we've never actually spoken."
"Maybe he thought he could get pussy by proxy."
"Pussy by proxy?"
"Yeah, his big brother probably told him that he hit it, so now he wants to as well and thinks it will be easy because he's his little."
"Awkward"
To be excited by the object of ones unrequited desire's cruelty to loved ones or third parties as a means of personal subjugation.
To enjoy the cruelty of the powerful over the powerless when powerless yourself.
When the one you can't have insists on being cruel to the one you've got, and you cum in your pants? That's not even masochism, it's masochism by proxy.
A non-Asian person who relentlessly adopts Asian culture, food, and its holidays is Asian by proxy. They know more about Korean barbecue or Vietnamese pho than should be allowed. They understand the eye contact paradox (Westerners insist on eye contact as respect, Asians refuse to make eye contact to elders to honor them.)
Look at blondie, ordering sushi, no idea what she asked for, but Asian by proxy.
Vehicular Munchausen syndrome by proxy (VMSP) is an automotive disorder in which an automobile owner repeatedly makes appointments for cartrouble (such as strange noises, ignition problems) which then refuse to occur when at the repair shop for diagnosis.
"They brought their Saturn in again for that 'grinding noise.'"
"You can always tell when a couple like that is having troubles — it's totally Vehicular Munchausen syndrome by proxy ."