Tsteamdoku 

Leaving a game unplayed after buying it, typically sorted together with other unplayed games.

Tsteamdoku is derived from the Japanese word "Tsundoku."

All of the Steam sales have given me a bad case of tsteamdoku.

Tsteamdoku by JuliusSeizure May 4, 2015

Steamdoku 

The act of buying games on Steam that you will never play just because they were cheap
The word was probably coined by a fat weeb called Ronnie who's obsessed with Japanese culture

"The valve collection seems pretty cheap, but I don't want to commit Steamdoku"

Steamdoku by _Pato_ August 13, 2018