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1.
An opperating system created in the early to mid 90's that was vastly supperior to many OS's currently. It's unfortunate demise was spelled out by poor driver support and lack of funding.

It now lives on only in verious open source projects and some offhand Palm workshop.
I wanted to convert to BeOS, but it died before truly reaching usable status.
by drk_ghost April 13, 2003
 
2.
Beo
Someone who is a bitch, or someone who is being a bitch.
Shutup, beo.
by nate March 12, 2003
 
3.
Unlike Linux, BeOS was a REAL operating system which was stable, fast, and booted up within 20 seconds. The OS had fairly good hardware support, was easy to navigate, had programs that were easy to install, and had a good amount of multimedia tools. It would have been a perfect alternative to Windows had the BeOS executives decided not to try in vain to sue Microsoft and ultimately bankrupt themselves.
Oh well.
by PC User June 23, 2003
 
4.
Beo
Vietnamese term that is an adjective for "fat or chubby"
Guy: I like you.
Girl: I don't feel the same way.
Guy: Why not?
Girl: Man, you're so beo!.
Guy What the heo...Pho Dat Bich.
by Pat Mahcrotch November 09, 2009
 
5.
BeOS It's the OS.
I use BeOS simply because it's the OS!
by Daniel Mark June 22, 2003
 
6.
BEO
BEO - Brown Eye Odor
Someone left a trail of BEO here. (brown eye odor)
by DNEZ January 30, 2008
 
7.
beo
A. colloquial spelling of body odour.
B. boxed shaped at one end.
C. masculinity, ergo with heightened stupidity and humour.
B. i couldn't see past beo's head
C. what a beo!
by maury June 04, 2005