Fear of flushing a toilet lest it overflow.
He changed stalls in the public bathroom because of a severe case of overflowbia stemming from the huge wad of toilet paper in the first stall he tried.
by pyrodoctor October 30, 2008
The inherent fear when you've just taken a big dump and flushed the toilet, that the water is going to spill over the edge of the bowl because you've clogged the toilet.
I had a severe case of overflowbia at my in-laws as I saw toilet water rising towards the rim of the bowl.
by Vegas Stu August 20, 2009