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A sirius attitude is an attitude in which the person being sirius should not be taken seriously unless it is a serious matter. If it is not a serious matter, it then becomes a sirius matter, in which case one can simply overlook it to save themselves time.

Sirius can be spelled as SIRUS as well.
Sirius may also be used as an adjective, such as a Sirius Shadow (to describe a person), where no one cares about what he says, or a Sirius Noob (to describe someone being overlooked for being bad).
Sirius by Glitechnia October 7, 2007
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A large boxy satalite radio that is often boxed with a trailer. This is so that you can tow it behind the Mack truck you will need to buy to listen.
Damn that Sirius radio is big.
Sirius by Sh0rtBus July 3, 2005
A satellite radio company that, by Wall Street investor standards, is BLEEDING MONEY PROFUSELY. Even Mel Karmisin and Howard Stern won't be able to revive the franchise.
Q: What is this red stuff falling from the sky?

A: That is Sirius Satellite Radio and they are bleeding money.
A satellite radio service that is the only competitor to XM at this time, and has a third of the suscribers than XM.
XM is kicking some Sirius ass.

Sirius got own3d by XM.

This Sirius-ly sucks.
Sirius by Agent J November 14, 2004
Sirius, is the most beautiful woman according to Reedwan. She has amazing facial features, and she is smart. Other than that, she has big watermelones, and tight kitty.
Person A: Reedwan, you know Sirius?
Reedwan: Yeah, she's beautiful AF, I got horny.
Sirius by TheCoverBro January 24, 2019
The definition of gay, Sirius is the stereo typical name for a gay person
Me: Man Sirius is a real gay nigger faggot
Sirius:NO IM NOT *cries in the corner like a little bitch*
Sirius by Petemos June 2, 2019
The coolest dude ever. He's like... really gay but also extremely pretty and amazing and incredible and his super awesome boyfriend loves him so so much!!!!
'Hey is that Sirius and Arlo???'
'YES OMG THEY FINALLY MET IN THE BOOKSHOP WOAH????!!'
Sirius by homokingwolf October 28, 2021