GZA's first couple bars:

"The echo chamber enhanced the flow at the block party
keepin emee heads spinnin like dark bacardi//
this bhc? is 2.3 now livers damaged
but the lungs are joint free//
so in-hale exhale breathe and get well
kick something live stop chirping like nextels//"

It's str8 piff but what is bhc? I get that one line but I don't know the significance of bhc and the 2.3 level. Is that like the level of alchohol in the drink?