In SimplyNailogiclish being a "sock" is when you or another is wearing a very large piece of clothing with a hood, this hood should be covering at least half of your face to be considered a sock, most socks are quite warm.
You: Hey it's kinda cold!
CrIsTiNe: WELL I'M NEVER COLD BECAUSE I'M A SOCKKKKKKKKKKKKKKKKKKKKKKKK