Green’s Dictionary of Slang

carl comedian n.

[ironic use of SE comedian + assonant ‘proper’ name]

(US campus) a dismissive term for a raconteur whose jokes and stories fail to have the desired impact.

[US]L. Birnbach Official Preppie Hbk.
Burrage Family Scrapbook 7 May 🌐 The boy has been a regular Carl Comedian of late.