overcommitteed 

The stressful state of having taking on two many group projects and committee roles. Variation of "over-committed."

Mary signed up to head the website redesign, help plan the holiday party and chair the fall fundraiser committee. Now she's so overcommitteed I think she's going to have a nervous breakdown.

overcommitteed by Shanthrax138 October 29, 2009

overcommitter 

people who routinely agree to do too much, as a matter of habit.

Steve was a serial overcommitter; he was on every project and was barely able to keep up with his work.

overcommitter by pulmdoc November 29, 2009