Description:

The term 'toppa' is an Old Common word that means something like a forum, a theatre or a court.

Noun:

A 'toppa' is any open place where people gather and individuals may be heard by a crowd, or the virtual, online equibalent. It is not necessarily public, if it is public, one could say 'ny affe toppa', a public forum. A court of law is also a toppa, 'ny hylys toppa' is needed to disambiguate.

Verb:

Toppa is not much used as a verb, but can be used as a happat verb of communciation similar to zisse, with the sense of saying something openly for others to overhear.

Modifier:

The modifier form 'toppas' has a sense similar to 'affe', meaning  something like 'in a public form'.