Blogstipation = Having things to write that you can not get started on or continue. Can be either a physical limitation (having no time) or a psychological condition similar to writer's block.
This is the opposite of Blogorreah; the inability to stop writing whether it be based on interesting facts or unsubstantiated babbel.
There is also inblogestion; the occurance of sickness after writing something that you realize was not all that pleasant.
Thanks @ninjapoodles and @mousewords