Noun
Examples
A leaves for vacation for two weeks during the summer. B mows A's lawn. B requests payment for this service. Under common-law doctrine, B is not entitled to any payment from A beyond whatever A cares to give.
officious intermeddler (plural officious intermeddlers)
(law) A person who voluntarily, and without request or pre-existing legal duty, interjects himself/herself into the affairs of another, then seeks remuneration for services or reimbursement.