Someone who can pass through a process, situation or event unnoticed, yet still leave a measurable or lasting effect.
Following the caucus no-one could adequately describe the Gray Man, yet the changes he wrought on the discussion was undeniable.

The Gray Man is like faith...

The substance of things hoped for, and the evidence of things unseen. - 1st Hebrews.
by ipublius May 23, 2020
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What you disgustedly see when viewing a profile or friendship-request for someone who either has cancelled his/her Tagged account or has not uploaded a photo, and so all that's there is a "generic" pale-sliver silhouette of a gal's or guy's head, with no facial-features or other identifying details at all.
I think that a lot of ghosts must be creating profiles on Tagged/hi5, since a lot of them merely have gray lady/gray man images, and the profiles "fade away and disappear" so readily and frequently.
by QuacksO May 17, 2019
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Man who is always over shadowed by women or always the casual pick, but never boyfriend material.
(The middle man between boyfriends)
Mike: Yeah Kaeleigh said she wants to keep things casual.
Jack: That's three in a row.
Mike: I'm just a gray man for women.
by JustHooded February 27, 2020
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A man belonging to his lady with the last name Gray
He is taken. He's Grays-man
by MAG&RCG January 26, 2017
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