Ah
Squiffy, is a term to describe a feeling of being "off" for example, one would feel somewhat squiffy, if the Butler fails to deliver ones afternoon Tea and Crumpets, or if ones Bordeaux is served at anything but the correct temperature. It is and indeed can be used to describe ones general health, for example , One feels somewhat squiffy today , one really must not partake so liberally of the hors' douevres at the club old boy, however the term can also be replaced in this instance with the word Collywobbles, if one is addressing ones Mater, or ones Nursie , when dealing with enquiries into ones health and well being.
So broadly translated into World Speak, ( wish these foreign Johnnys would use and understand an Englishman when he speaks !! ) it can mean anything from FUBAR to knackered, or on the fritz, or up shit creek without a paddle......Seriously how common is this vile usage of our beloved English language, squiffy is a most wonderful and descriptive word with multiple uses, and may be used to convey many emotions or feelings, without getting too over excited and "Foreign"
I do so hope that this is an adequate explanation for all to read and understand. Pip pip old bean .