Software that isn't deliberately made to be malware but by it's function slows your computer/device enough to make it not worth using.
For example, Blackberry BBM Enhanced Symbols, an integrated menu that gives you a huge array of smilies and other symbols but bogs your smartphone down.
-Did Joe send you the link for the BBM Enhanced Symbols menu?
-Yeah. I uninstalled it though, it's clunkware.
-Joe should be beaten.
-Yes, yes he should.
-I'll fetch the truncheon.
-And I shall prepare the oranges. For halftime.
Title given to voco-prophets: those individuals blessed with foresight and visions of the future by their patron deities Hatsune Miku and Kagamine Rin.
This future foresight however comes at an expensive cost, as they usually are drived into Touhou and Adeptus Mechanicus addictions over time.
"You hear about Ben? I heard he got turned into a Clankwork."