The opposite of ma'am commonly used when speaking to a man.
Yes, sir
by David June 10, 2004
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what a young girl calls an older guy she likes.
Are you really 18?

Yes sir, I'm really 18. *blush*
by love em young April 26, 2008
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Sir -- sound is irrelevant

An initialism used when you want to warn people that a video has sound or music is irrelevant to the video. Sounds that weren't initially part of the video would be labeled "SiR" because they have been added on for another effect or purpose.
I just realized that this was an SiR video, the sound effects were added afterward. These aren't the real sounds.

I hate seeing videos that should be labeled SiR because they have loud annoying music in the background that goes over the original dialogue and sounds.

Video title: cute puppies SiR
by Aficionado April 2, 2012
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A really fucking annoying word used by a stranger to address a male stranger.
"SIR!!!!!!!!!!!!!"

other guy: "SHUT THE FUCK UP"
by askldjgsklg August 19, 2009
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Stands for Service Industry Research Systems. Basically the worst job in the world. You can get hired there if you can say your alphabet, and pretty much everyone you know has worked there at some point in their life. It is rare that anyone lasts more than 2 weeks and those who do are clearly incredibly high and have no idea what's going on or how much their life sucks.
Got hired at sirs last week, find myself increasingly in need of a gun every minute spent at this place.
by kloeker November 22, 2011
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A woman who looks like a man. Typically wearing loose fitting pants, a flannel, and her attire is complemented with a gentleman's haircut.
Me: Hello, sir.
Sir: I'm a woman.
Me: Sorry. Have a good day, fella.
by A. Hunt September 15, 2008
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SIR: Standard-Issue Information Retrieval Unit from Invader Zim.
The SIRs lined up to be taken by their new masters.
by Kain-chan May 26, 2004
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