And when Bob says that "flowers" and "showers", etc are pronounced "floors", he's right.

Except he doesn't means the things you walk on (I don't think he does).

It's the same pronunciation as "flew" or "flue", but with a trailing "r".

Sometimes it can have two syllables: Floo-euhr
or Floo-ur or whatever version of an unstressed central vowel you prefer.

Not sure any of that helps.