I had asked my doctor if i was having a problem with my ejaculation and he responded "the plumbing is fine" i honestly do not understand what he meant by that and it left me feeling confused. can you please help me understand this? thank you so much?

The main sexual organ of the body is the brain. The external parts just service that function. I interpret the docs' statement as meaning the pipes are clear and not the cause of the issue. You may want to consult a urologist who specializes in sexual problems. This is relatively common.

I think he meant all the parts of your body that physically work to ejaculate are working normally. For example your testicles and penis and prostate are working normally. This implies that the problem can be psychological or emotional. Consult a urologist for specific advice.