Frust-A small line of debris which refuses to be swept onto a dustpan, causing the sweeper to back across an entire room, finally reaching the edge of a rug, which the debris can then safely be swept under. 5

Yeah, okay, there IS a need for a word for that! That drives me nuts. If they made a word for to throw out of a window (defenestration, I think that's how it's spelled), then there's room in the dictonary for this word.