Definition
Friends who have underworld connections or are involved in shady underdealings.
Friends who lack culture or sophistication.
Opposite In Meaning
How People Actually Use It
Someone who isn't very popular, or influential to society, or online. Example; fast food worker, gas station owner, cashier, gardener, ECT.
"Person 1 II just realized, I've got friends in low places. Person 2 What does that mean? Person1 Oh, it means that their just another one of a long line of no ones. Person 2 So people who aren't very popular? Person 1 Yeah, basically."
Source: Urban Dictionary