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1.
A growing collection of video games that have yet to be opened and played, likely due to the fact that so many good games come out and the owner simply cannot keep up.

This is most commonly an issue for professionals in the video gaming industry.
"My Stack of Shame keeps piling up higher and higher! Skyrim, I wish I knew how to quit you!"

"Don't even bother pointing out the fact that half my games are still in the plastic wrap—I am acutely aware that my Stack of Shame is ridiculous."
by CadeRageous February 27, 2012