Term used by sales folks, both at Cisco and at resellers, to describe those companies that have an “Anything But Cisco” policy.
There are quite a few people who have a bias against the biggest / largest / popular / leader in any market and in the networking market, Cisco is no different. Typically led by someone who has a lasting grudge or bitterness against Cisco ((and growing these days as Cisco appears to mistreat their staff as standard practice)) and will look for any product that is specifically not Cisco to purchase in a given market.
These people have been buying Nortel, 3Com, Extreme, HP and Foundry switches, Checkpoint/Nokia firewalls, and other odd pieces of kit that have quirky and immature capabilities and spend a lot of time fixing these things.
Personally, I am sympathetic to the idea, and believe that big parts of Cisco’s product portfolio is junk (for example: IP Telephony, Video Conferencing, NAC and WAAS for starters), but swinging to the other extreme is failing to recognise what Cisco does well…… routers and switches.
I take a pragmatic approach, and evaluate products on their merit, but tend to stick with Cisco for core technologies. I wouldn’t go completely to an anti-Cisco stance, that’s going to cause yourself a lot of problems. And who needs that….