another term for running train; fucking a girl in a cold environment, such as in snow or in a cold car during winter
example 1
Bro, I got a setup. Fire up the Polar Express!
example 2
I turned off the heat and polar expressed her all night.
example 3
All Aboard The Polar Express!
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having a female on deck for a bootycall and/or train
example 1
I'll meet up with you later. I got a setup scheduled in an hour.
example 2
Bro, I got us a setup for tonight! Hop aboard the Polar Express! CHOO CHOO!
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