An extention on the original term of beaz. If a person from the projects (or Tim Westwood if you're from the UK) wanted to swear then they could substitute the nasty words (if they were moral) and replace them with ghetto sounding words that rhyme with beaz or beazus.
*Young man notices a woman on the tv with large breasts. He points it out to his mate*
Willin: Look at the tits on her!
Barry: Sheazus Beazus! Elephanteezus!