Also a
term used to
describe a secondary
action or
occupation, particularly an
odd one. For example, my father (a
judge by trade) was known at his
office for moonlighting as a
Truly Nolen man, because he does all his own
pest control (out here, that means
pack rats) and helped several other
judges and
staff through their own
rat problems.
And Everything2 is officially an open database but moonlights as a self-help clinic. Or something like that.