Any generally harmless computer software that is designed specifically to vex or irritate the end user, often installed on the user's computer without knowledge or consent.

Vexware can include - but is not limited to - applications with uncloseable screens, infinite message loops, or the changing of the user's desktop wallpaper without consent.
"While I was away from my desk, someone installed some vexware on my machine! Now, every time I restart my computer, Freddy Krueger says, 'Welcome to my world, bitch!'"
by Aardaerimus February 12, 2012

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