1 When the "idea bulb" (known from many looney toons cartoons as the formation of an idea) turns on but it is not all that great of an idea.
2 A non tech savy person who is dumber than the equipment they are attemting to use.
EXAMPLES in USE.
1 Who's dimwatt idea was it pack a raft for our trip to Death Valley? Oh yeah; yours.
EXAMPLES in ACTION.
2 Cutting yourself with a multi-tool.
Unable to use a fax manchine.
"Video Professor(tm)" customers.