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when you fax someone an entirely black sheet of paper
"Ugh, John keeps sending me shadowfaxes"
"Hey Jimmy, I got your shadowfax last night, very funny"
shadowfax by emmaoryx September 27, 2020
omg i just got owned by shadow_fax, damn he's l33t
shadowfax by shadow February 25, 2004

Shadowboxing 

When a person punches in motion at nothing particular, preparing for a fight or physical fitness.
Rocky is well known for his Shadowboxing!
Shadowboxing by Strong Chuy July 15, 2009

Shadowlands 

An unholy realm peopled by phantoms, spirits and ghosts that are in a perpetual disturbed state, awaiting execution.
Only in the Shadowlands can what you seek be revealed.
Shadowlands by Shougo February 23, 2023
Kathryn 'Kitty' Pryde, one-time youngest member of the legendary mutant team known as the X-Men. Her power was known as Corporal Intangability, which would let her 'phase' her molecules through any solid object, effectively passing through it like a ghost. Formerly known by the code names 'Sprite' and 'Ariel,' she later went on to be a founding member of Britain's premiere superhero team, Excalibur.
Running as fast as she could, Shadowcat phased through the obstacles that got in her way.
Shadowcat by Sleazy E February 23, 2004
Banning a user from a web forum in such a way that the banned user is unaware of the ban. Usually takes the form of showing that user's posts/profile/etc. only to that user; other users never see them. Considered underhanded chicken-shit behavior.
Fark has turned into a bunch of shadowbanning pricks.
shadowban by Atario July 18, 2007