You may have better luck Googling the term "exclamation compounds" which is the term at least one linguist uses
The linguist is Gretchen McCulloch, author of "Because Internet" (which also discusses "Exclamation Compounds")
Quote from the link above:
If you spend time on certain linguistically innovative corners of the
internet, you may have noticed a new way of putting words together,
with as the title suggests, exclamation marks. I’m going to call this
construction exclamation!compounds, for obvious reasons.
History of Exclamation!compounds
My first memorable encounter with exclamation!compounds came from The
Lizzie Bennet Diaries, a webseries in which many characters act out
other characters in costume theatre. When a character is acting
another, the resulting character-within-a-character is referred to by
exclamation!compounding maincharacter!actedcharacter. For example,
Jane playing Darcy is Jane!Darcy, and likewise for Lizzie!MrsBennet
Fanlore traces this usage back to 1997.
The adj!noun format is purported to have started in X-Files fandom.
Good examples for this are Wombat's Spotter's Guide to the Common
Krycek and the accompanying Spotter's Guide to the Common Mulder where
several Krycek sub-species such as Bad to the Bone!Krycek, Bad but
Lovin'!Krycek, Hot'n'dirty!Krycek or Misunderstood!Krycek and Mulder
sub-subspecies such as Angst!Mulder, Basketcase!Mulder,
HappySlut!Mulder, Sensitive!Mulder and WellAdjusted!Mulder are
described. The first usage was Action!Mulder, referring to canon
scenes where Mulder suddenly went all actiony (instead of talky),
followed by Saint!Scully. Eventually they lost the initial capitals
and the canon connections; by the time it hit other fandoms, it was
being used to describe fannish things.
Another X-Files mention, this one from the FAQ for OBSSE in 1997:
"'Where did "!Scully" come from?' This is a sort of shorthand for
describing our favorite characters, depending on what they were doing
(such as Action!Scully or Kickass!Scully). It's sort of a designation
for hypothetical action figures. For more information on some of the
Order's favorite hypothetical action figures, see the October 1997
OBSSE Newsletter Poll."