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
by Shiranai April 23, 2008
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!"
by Jacob Chesser April 1, 2004
An accessory worn under the kilt
<accent="Irish">Ia! Ia! I've caught me fhtagn!</accent>
by September 14, 2020
Word which roughly translates to waits/dreams/sleeps in a long forgotten tongue.
"Iä! Iä! Cthulhu fhtagn!" Rejoice that Cthulhu sleeps.
by Cyberserker July 11, 2008
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.
by stripping_welsh January 8, 2012