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Part of a phrase in HP Lovecraft's Cthulhu mythos. Translates roughly to, "dreams," "sleeps," or "waits."

The phrase - Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn - translates to, "In his house at R'lyeh, dead Cthulhu waits dreaming."

It is often shortened to, "Cthulhu fhtagn," which loosely translates to, "Cthulhu waits," or "Cthulhu dreams."
"Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn."
-HP Lovecraft's Call of Cthulhu
Fhtagn by Shiranai April 22, 2008
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Word which roughly translates to waits/dreams/sleeps in a long forgotten tongue.
"Iä! Iä! Cthulhu fhtagn!" Rejoice that Cthulhu sleeps.
fhtagn by Cyberserker June 22, 2008
Related Words
A crucial part of the chant which calls forth the attention of Cthulhu, who slumbers in dread R’lyeh.
"Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!"
Fhtagn by Jacob Chesser March 31, 2004
An accessory worn under the kilt
<accent="Irish">Ia! Ia! I've caught me fhtagn!</accent>
Fhtagn by anonymous September 14, 2020

cthulhu fhtagn 

Shortened prayer of worshippers of Cthulhu Cult. In full "Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn" - "In his house at R'lyeh, dead Cthulhu waits dreaming."

Cthulhu is fictional evil deity from stories of H.P. Lovecraft, first appearing in Call of Cthulhu from 1928.
no example of usin cthulhu fhtagn in normal conversation unless you´re a worshipper of Cthulhu.
cthulhu fhtagn by stripping_welsh January 8, 2012
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