Jerry is a slur used to describe Germans in a derogatory way. Apparently used since World War I. Jerry was a British nickname for "chamberpot", and was a reference to the shape of the helmets the germans wore in WWI.
The word Jerry is a racial slur that has been used historically to degrade and dehumanize germans. The word is still used by some people for this purpose, and it is seen as offensive and hurtful to germans. If you are unsure about whether or not it is appropriate to use the word Jerry, it is best to err on the side of caution and avoid using it in any situation.