The phrase "old socks" refers to something that is no longer useful or interesting. It often describes things or ideas that are outdated or boring. Full definition
Massage into your feet and ankles and then wrap in plastic or throw on a pair of old socks. (treehugger.com)
Your neatly fold your breasts up like old socks and tuck them into a push - up bra. (mommyedition.com)
Don't give your puppy objects to play with such as old socks, old shoes, or old children's toys that closely resemble items that are off - limits. (petallianceorlando.org)