"I don't know what your thinking about but you need to get those yamps out of my apartment ,dude. From now on I'm checking all yamps ids at the door. I'm not trying to end up in a celly like R Kelly."
An old person and/or someone who is not fun. A kill-joy, elder; fun-hater. Not to be confused with ageism, by any means.
While we were car scaping, I looked to the left of me in order to sing an obnoxious song off the radio to another driver, who was in another automobile. The balding patches and discontent look gave me the notion, he was indeed a yamp.