full of prunes

full of prunes

Nonsensical. From the idea that prunes cause gas (and being "full of hot air" is synonymous with "nonsensical"). His explanation is totally full of prunes and doesn't answer the question at all.
See also: full, of, prune

full of prunes

mod. full of nonsense. (see also full of beans. Prunes can cause gas = hot air = nonsense.) You’re just silly. Completely full of prunes.
See also: full, of, prune