Dutch Plumber 

Having someone complete the act of masturbation by pulling up and down on the forearm, while the male holds his own penis standing back to back.

The boys didn't fancy watching each other, so they gave the Dutch Plumber a go.

Dutch Plumber by Sneaky_Hibiki August 28, 2010

Dutch Plumber 

a Dutch plumber is a sexual term usually used amongst trade workers. To perform a “Dutch plumber”, when one guy inserts an ABS pipe into the anal cavity of another and spray hot or cold water into the pipe.

Those plumbers probably gave each other a “Dutch plumber”.
Take your shirt off and give me a “Dutch plumber”.
The boss’s son gave me a “Dutch plumber”.

Dutch Plumber by Mr. Kenny January 20, 2019