A thrase/pun used by splatoon players to replace "on god"
Other splatoon-related puns include(to my knowledge):
Krill yourself
for eel!
cod fucking dammit
I swear to cod-
Less common:
the shell?
holy karb
Splatoon player 1: The body is dispensable the grind is not
Splatoon player 2: on cod!
Taking a shit in a toilet, and taking your rock solid dick and dipping in the shit.
Shaun: "Hey Mike have you ever tried the smelly cod?"
Mike: "Never what's it like?"
Shaun: "Pretty decent just make sure it not all goopy and the smell isn't that bad."
The situation is a total sausage fest, too many men, not enough women.
This party blows man, too much rod, not enough cod