What does 'you better' mean in this context? Is it omitting some part from its full phrase?
The following is a excerpt from an interview script on Linux Journal:
Guid: ... If you talk to people, they all think Windows stinks and UNIX is the one true operating system.
Phil: I think that too!
Guido: Well, you better, given your choice of profession!
Note: Phil is working for Linux Journal.
What does you better mean in this context? Is it omitting some part from its full phrase?