Anonymous Caller: Me and my cousin do the Thomas the Tank Engine Pipeline for fun.

Whataburger Employee: What's that?

Anonymous Caller: Its where you take a Thomas the Tank Engine toy and put in a condom and shove it in each other's ass.

Whataburger Employee: Sounds like fun I'll try it after work!
You take a Thomas the Tank Engine toy and put in a condom and shove it in your ass or another's ass for fun; then you have a Thomas the Tank Engine Pipeline.
by An Enthusiast of Pipelines December 13, 2022
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