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1.
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."
by Stevie Crow May 16, 2010
 
2.
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"
by Shadowman June 30, 2004