A sound mimicking the loss of air, as if someone's solar plexus had just been struck.
A sound made in pain, as when expelling air after being struck.
Money. c. 1850 – c. 1940
: an administrative subdivision of imperial China; the capital of such divisions.
A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar.
"Suppose we have two objects, foo and bar."
Expression of disappointment or disgust.
"Oh foo – the cake burnt!"