“Hipster ghosts are too ghoul for school”

“Too cool for school” is an old saying. “Too ghoul for school” is a popular Halloween saying from at least the 2000s.
 
“Hipster ghosts are too ghoul for school” was posted on Twitter by Ben Kronberg on December 24, 2010. “Why are ghosts so uneducated? They are too ghoul for school. #comedy” was posted on Twitter by Nicholas Krammes on October 23, 2012.
   
         
September 2005, Cosmo Girl (New York, NY), “After-School Specials,” pg. 66:
This ghost’s just too ghoul for school!
 
OCLC WorldCat record
Too ghoul for school
Author: French Frights
Publisher: London : Egmont, 2007.
Edition/Format:   Print book : Juvenile audience : English
Summary:
James, Alexander and Lenny are three friends in year seven. Together, they prevent a plague of zombie nits from turning everyone at St Sebastian’s School into the walking dead, save their school from an unusual invasion and finally thrash rival school St Mary’s at football with a little help from a fiend.
 
Twitter
Ben Kronberg
@benkronberg
Hipster ghosts are too ghoul for school
1:15 PM - 24 Dec 2010
         
Twitter
Nicholas Krammes
@NickKrammes
Why are ghosts so uneducated? They are too ghoul for school. #comedy
2:43 PM - 23 Oct 2012
 
Twitter
Greg Janda
@GregJanda
Why couldn’t the ghost get his degree? He was too ghoul for school. #SundayPunday
10:22 PM - 28 Oct 2012
 
OCLC WorldCat record
Too ghoul for school.
Author: Pollygeist Danescary
Publisher: [Place of publication not identified] : Little, Brown, 2014.
Edition/Format:   Print book : Fiction : Juvenile audience : English
 
Reddit—Jokes
Why was the ghost uneducated?
submitted May 17, 2015 by Phatperson
He was too ghoul for school
   
Reddit—Jokes
I tried to bring my dead friend to class with me, but the teacher kicked him out.
submitted October 21, 2016 by redditurded
Guess he’s too ghoul for school.
 
Twitter
Gary Miller
@gazgagsman
Some ghosts are too ghoul for school
#YourBestPunJokes
3:04 AM - 14 May 2018