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proprietariest 

Someone who swears by proprietary software, ignoring and often ridiculing open source equivalents that may infact be superior.
person: John's obsessed with Windows Vista!
person2: what a proprietariest.
proprietariest by Blank__ February 24, 2009
Related Words

proprietard

Use this word when someone insults you for using open source software while they use or make proprietary software, acting like closed, corporate tools are automatically superior. It calls out that smug "locked-in but proud of it" attitude.
Person 1: Hey, you're a freetard for playing Luanti instead of OG Minecraft.

Person 2: It's my freedom of choice. Go away, proprietard.
proprietard by tenorastride684 December 29, 2025