Grease railing 

When a male takes a random shit in a public area and uses the feces as lubrication to achieve a heavenly orgasm thru aggressive masturbation.

There is a train passenger in San Francisco that takes random shits on buses and masturbates with feces.......
grease railing is a tool used to lubricate the rails of light rail trains.

Little to the bus drivers awareness that the lone passenger was going to achieve grease railing at the last stop!

Grease railing by hashtag powerful aka aww nawl January 12, 2019

greased the railing 

When an individual takes a shit and wipes their ass on the seat.

Bill did not like the night time cleaning lady, so he went to the restrooms in the office and then greased the railing .

greased the railing by richardStabone July 28, 2010