Another Man's Trash

Wearing of a condom that has been previously used and ejaculated in.

After Tom, Jess and Shawn, Matthew B. wore another man's trash for his turn in the gang bang.

one man's treasure is another man's trash

What one sees as valuable, another would view as garbage or junk. Reversed form of "One man's trash is another man's treasure".

Peter: OMG, you have the Johnny Seven OMA Gun! That was the coolest toy ever as a kid.

John: Throw it out man. That thing is worthless, I kept losing all the ammo.

Peter: I guess one man's treasure is another man's trash.