As far as I know, when a French word begins with a vowel, the glottal stop precedes it. This does not happen in English, but many dialects (e.g. the urban dialects of London, Edinburgh, etc.) use the glottal stop in words such as "little,

But I think your "oy" is what I know as "oi!", an interjection that I closely associate with white-supremacist Nazi skinheads, especially if they have Cockney accents. Time for some thread drift: in a novel I read recently by