The Port refers to Port Glasgow, a town in the west coast of Scotland. People who aren't local tend to confuse Port Glasgow with the city called Glasgow, so the Port works as a nickname to avoid this confusion.
Port Glasgow is next to Greenock and smaller places like Kilmacolm and Langbank. It's home to the Port bird.
"Where are you from?
"Port Glasgow."
"Oh I love Glasgow!"
"I'm not from Glasgow, I'm from the Port!"
A man who dates women with the sole purpose of exploiting their time, energy, and labor while he sucks the joy and happiness from their lives.
"That guy's a soul digger. He'll expect you to work full time, but you'll be doing all the cooking, cleaning, laundry, shopping, and childcare while he plays video games or watches TV."
A person pretending to be something they aren't, or an impostor. This is inferred because of the old alien movies where alien pods appear on earth and the "pod people" dispose of the humans and slowly reproduce the bodies, pretending to be humans.
The pod person was pretending to be my father, but I knew that he was an alien when he acted differently than my father ever would have.