the act of reminiscing about a bygone era or way of doing things in a manner that elevates oneself and one's experiences, while denigrating those who take an active part in modern events/trends/etcetera
When older generations call younger generations "lazy", "narcissistic", "entitled", and "disrespectful", while insisting that THEY were never that way when they were young, they're doing little more than wanking nostalgic.
"Everything was so much better when I was young. Kids these days are ruining the world/subculture I grew up in."
"Quit wanking nostalgic. Things were plenty fucked-up back then, too, and you know it."
"Back in my day . . ."
"Ignore Grandpa. He's just wanking nostalgic again."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"