[very common] The result of a bug or malfunction. This is a mass or
collective noun. What a loss!
and What
lossage!
are nearly synonymous. The former is slightly more
particular to the speaker's present circumstances; the latter implies a
continuing lose of which the speaker is currently a
victim. Thus (for example) a temporary hardware failure is a loss, but
bugs in an important tool (like a compiler) are serious lossage.