secondhand listening 

When you hear everything that is said nearby, but you really don’t want to.

I learned all about what it means to be an adult while secondhand listening to drunk people at our backyard pool parties outside my bedroom window on school nights.

secondhand listening by Dr Bunnygirl June 26, 2019

Second-hand listening 

When you hear a piece of music not as a full-song but as a snippet being used in other mediums, such as for a meme, advertisement, movie scene, TikTok, etc.

"I just realized I know this song, even though I never directly listened to it or knew its name."

"Yes. That's called second-hand listening."

Second-hand listening by Mayhem.Projector February 24, 2021

second-hand littering 

Refers to where you pick up a discarded object to examine it for possible value to you, then decide that you don't want it, either, and toss it down again.

Second-hand littering has been a hotly-debated topic for eons. One the one hand, a person who picks up something that someone else has already thrown away likely feels that it's not his responsibility to go and find a trash can for said discarded object just because he briefly handled it, since he was not the one who originally discarded the item, and he himself is a conscientious bloke who never litters like that with his own trash. But many other humans disagree --- they feel that by tossing away the item again, this "second" person is littering just as much as the "original" litterbug, since he, too, is dropping an unwanted item on the ground. "Dropping any unwanted item on the ground instead of in a trash can is still littering," they insist, "regardless of whether the item was already there or not!"

second-hand littering by QuacksO August 17, 2018