pinch blogger
one who takes over a blog while the blogger is temporarily occupied by more pressing matters or is otherwise unable to blog. the length of time a pinch blogger posts depends on the blogger and pinch blogger's arrangement. derived from "pinch hitter." may or may not contain a hyphen (pinch-blogger). may also be modified to verb form: pinch-blog.
I need a pinch blogger to take over the site while I'm in Zimbabwe for two weeks.