“What do you call a surreptitious shellfish?”/“Clamdestine.”

“Clamdestine” (clam + clandestine) is an infrequently used and jocular shellfish term. “Clamdestine—Something secretive among shellfish” was published in The Arizona Republic (Phoenix, AZ) on October 26, 1997. “What do you call a secret meeting of shellfish? A CLAMdestine Operation” was posted on Twitter on June 30, 2012.
 
A riddle was posted on Reddit—3amjokes on January 17, 2018:
 
Q: What do you call a surreptitious shellfish?
A: Clamdestine.
   
   
26 October 1997, The Arizona Republic (Phoenix, AZ), “Too much flinguine and you’ll Zanzibarf” by Sam Lowe, pg. 10EV, col.6:
Clamdestine—Something secretive among shellfish.
 
Twitter
Paul ⚔️Hubans‏
@phubans
What do you call a secret meeting of shellfish? A CLAMdestine Operation.
12:56 AM - 30 Jun 2012
   
Twitter
Michael Wiggett‏
@Wigeru
Replying to @serafinowicz
@serafinowicz
Are surreptitious shellfish “clamdestine”?
9:40 AM - 19 Sep 2009
   
Twitter
Marcus2ReaLius‏
@JosephFDiMatteo
Shellfish are so Clamdestine
12:59 PM - 26 Jun 2012
   
Twitter
Taylor Holland‏
@hollatayy
What do u call a secretive shellfish?
Clamdestine…
Yeah I got jokes.. Bad jokes, but jokes…
2:21 PM - 6 Mar 2014
   
Twitter
Claude‏
@esotericutie
A show about a shellfish struggling to hide his involvement with illegal drug trade from his otherwise normal family called ‘Clamdestine’
4:20 PM - 17 Jun 2015
 
Reddit—3amjokes
What do you call a surreptitious shellfish? self.3amjokes
Submitted January 17, 2018 by socialmediahandle
Clamdestine
 
Twitter
3AM‏
@3AM_Jokes
What do you call a surreptitious shellfish?... Clamdestine
12:09 PM - 17 Jan 2018