Here are some possibilities:
* "Basic": This is a common slang term used to describe someone or something that is considered ordinary, unoriginal, or lacking in individuality.
* "Base": This could be used in a slang context to refer to someone's "home base" or "base of operations".
* "B*tch": While not a direct synonym, this term could be used in a derogatory way and might sound similar to "baser" if spoken quickly.
To understand what you meant, please provide more context or an example of how you heard the word used.