It means like the person that someone has on the side not including his or her girlfriend or boyfriend.
I text my friend really late at night. Just to see what was going on. Her boyfriend then asked if I was her "Side Meat".
Щоденні сповіщення поштою
Листи надсилатимуться з firstname.lastname@example.org. Ми ніколи не надсилатимемо вам спам.