A slur used by internet racists and homophobes. It stands for the four Gs found in two very offensive term put together to make a ridiculous still offensive term.
The original usage was more popular in the early 2010s, and used by YouTubers such as iDubbbz or 4chan users, but had apparently been shortened to get around moderation.
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.