A person (typically living in Colorado) that spends most of their times in the mountains skiing, snowboarding or other, thus putting chains on their tires often.
“You hear that Chadspent an entire week in the mountains skiing and smoking weed?”
A Spy from Team Fortress 2, that doesn't know anything about spying, yet tries to "chain", these unintelligent individuals may also use a profile name, or rename their Conniver's Kunai, to a TF2Slurgi or tf2Klown references, or just downright steal their name/profile picture. These "people" may also think they are good because they 2 back to back stairstabs in players who installed the game a few days ago.
Person 1 : Dude this spy is so bad but he keeps going for the most obvious shit on me
Person 2: Yeah that's a clear case of chainer syndrome
Someone who defines themself as a hot rodder but has never worked on a car before. They pay a shop to build a car and perform modification/maintenance instead of doing it themself. Often they dont even know anything about the car they had built.
Bob: "Thats a nice 32 3 window over there" Tim: "Yea, but the owners a gold chainer, he doesnt even know what engine hes running."