Pronounced bow-ler, but not as in the old farts who roll balls down a length of astroturf on Sunday afternoons/cricket sense.
No, the bow part is pronounced as in the first part of a
doggie bark imitation, as in bow-wow, or
take a bow etc.
So there you have it. Babhlar. Oh right, the meaning. Basically, it's a very ugly woman, the rarest form of minger known to man.