Someone who becomes much more boring after starting a relationship, a shadow of their former selves.
"Is Mike out tonight?"
"I doubt it, ever since he's been going out with Sarah he's become a real shadowman."
Weirdo that plauges people and sites, Seems to hang around Portsmouth Area until migration comes when it heads north in search of cold.
spoted on: DDRUK, DDREI (rarely), Shadowman.TK, DDREX, B3ta (Sometimes), and various hats.
"That wanker Shadowman just stole my hat"