An old Scottish word for penis. The term was widely used by coal miners.

Also used when greeting friends or family. People you know really well.
Son: My pit lamps red raw!

Dad: Stop wanking all day and get a job!

How's yer pit lamp? ( How are you?)
Used in the same way a lot of people say "How's it hanging?)
by Steorge February 6, 2020
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