What is grease up your trotters?

Birkenhead Slang.
A female who prepares to arouse herself at the sight or sound of others participating in intercourse (i.e. listening to their neighbour; spying from a cupboard)

“Oh Julie, stop complaining - you don’t really mind them having sex so much. Just grease up your trotters and enjoy the free show.”

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grease up your trotters - video