http://qs1969.pair.com?node_id=290221


in reply to Etymologies and Dialects
in thread I refer to a non-specified carbonated beverage as a:

Tonic is a Boston term. I'm not sure how far it extends regionally - it may be another odd New England term like frappe. It always throws me for a loop because I tend to think of tonic as having the words "gin and" preceding it.

I don't know if it's used elsewhere.