Meaning of Inspect the plumbing

[Phiphili]

Dear Sir

Can you explain the meaning of these sentences for me?
Inspect the plumbing?
Hit the nail on the head?
To get steamed up?
To sit on the fence?

Thanks so much for your help,
Phiphi

[Jamie (K)]

Inspect the plumbing means to examine the water pipes in a house or building, or in slang to inspect a person's urinary tract.

Hit the nail on the head, as an idiom, means to make an extremely accurate statement. In a workshop it means to hit the head of a nail.

To get steamed up can mean to get very angry or very sexually aroused. It can also mean to get covered with condensation from steam, as when someone takes a shower and steams up a bathroom mirror.

To sit on the fence can mean not to take either side of a debate or argument. It can also mean to sit on a fence.