onpa
Onpa is a term that can refer to several different things, making its specific meaning dependent on context. One common usage is as a misspelling of "on tap," a phrase typically used to describe beverages, particularly beer, that are available from a keg or dispenser. When a drink is "on tap," it means it is readily available for immediate serving.
In other contexts, "onpa" might be a colloquial or informal term used within specific communities or regions.