Well, the problem is clearly that it is not.
(In case you are actually confused “duty calls” or “I hear the call of duty” (or “I hear the call of nature”) can mean the speaker needs to take a shit.)
Also, anon could be referring to the fact that soldiers on the field tend to dig holes to shit if there is no toilet available. Call of duty being a military based game could have had shitting mechanics like how actual soldiers in the field do.
Well, the problem is clearly that it is not.
(In case you are actually confused “duty calls” or “I hear the call of duty” (or “I hear the call of nature”) can mean the speaker needs to take a shit.)
“Call of doody”
Also, anon could be referring to the fact that soldiers on the field tend to dig holes to shit if there is no toilet available. Call of duty being a military based game could have had shitting mechanics like how actual soldiers in the field do.