One
bag of
something (non-standard) refers to a huge amount of something, or a whole heap/lot of something in the Jamaican dialect. It's use is not just limited to things. It can be used with people or even animals.
In colloquial speech the
word of is elided and becomes identical to 'a/ah.
One
bag of ants outside under the bench.
One
bag of unknown numbers keep calling me.
One
bag of hungry-belly pickneys live over Miss Janey yard.