Plural, internies - An Internal Fart. The gurgling, whale-calls your stomach and intestines make as they brew up some serious flatulence in trying to digest something you really should not have eaten i.e pizza and ice cream if you're a Lactard.
I've got a loud interny bouncing around in my gut .

The internies from eating that pizza are loud an achy!
by raunchymuchacho December 8, 2017
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