High Quality buds:
Chrons, chronic, fire, killers, pif, budder, kind, haze (incorrectly used for any high quality bud... this is mostly by the younger generation)
Mid Quality buds:
BCs, mids, middies, regs (depends who you talk to)
Low Quality buds:
Schwags, schwaggles, brown frowns, Mexican, regs (depends who you talk to)
I agree with AL, the only word for any GOOD or QUALITY hash or grass in the UK is 'scarce' and, as you don't get anything remotely like quality in the UK, the other word is 'non-existant'.