Soundy/Sound is a common word used in Glasgow and other surrounding areas which is a Scottish equivalent of cool/good.
Cool in a different sense like it's cool, not used for temperature ya banger.
Cunt wan : Alright
Cunt two : Alright
Cunt wan : Ye still need that Oz cuz?
Cunt two : Naw dan it's sound/soundy
Ye git the point ya cunt.