The polite way to tell people to shut the fuck up. Always insinuated, but never followed.
Now class, remember to use your inside voices while visiting to the museum.

But Miss Teacher...

For fuck's sake, I said 'inside voices', Tommy.
by RadioactivePuppy March 19, 2011
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when you say something you're thinking that you shouldn't have said out loud
Gee, that guy's really a jerk, did i say that out loud? Maybe i shouldn't use my inside voice.
by gcdude540 July 14, 2006
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An inside voice is the voice you use when you're inside somebody.
"I just love your poon," said Tyler in his inside voice.

"Unggh, unggh!" said Barbara, pumping away furiously.
by scodder June 9, 2010
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The voice a man uses when he's inside of a woman.
Aw yeah, baby, you know you wanna hear my inside voice.
by Necrosys March 11, 2015
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Speaking while inhaling as aposed to exhaling; Talking while breathing in to avoid someone nearby smelling your breath.
So Im pretty sure that Billy ate dookie puffs for breakfast this moring, because he failed to use his inside-out voice when he asked me for a piece of gum.
by Inhale-ilitosis July 20, 2009
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