The progressive addition of requirements into a project (especially
software) after the specification has been completed. This can result in bloat and an end product that seems to have lots of
extra bits attached with
duct tape.
This is often caused by managers or consultants that do not have a clear view of what product development entails and start sentences with "How easy would it be to..."
Just to warn you: Will is the king of feature creep. If he suggests another feature to you, tell him to run it by me first. That'll calm him down.