What is Glug glug glug?

The sound that fish make at the end of very insulting (to someone of my form) jokes:

Dad: What goes "Miaow! Glug glug glug!"?
Me: A catfish.
OR
My brother: What goes "Neigh! Glug glug glug!"
Dad: A seahorse! That was a good one!

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Glug glug glug - video