gym surfing Share definition Flag The practice of abusing free trials at various gyms to prevent paying for a membership. I'm only in town for a couple weeks but I gotta work out bro. I'm gonna try gym surfing so I don't have to pay. gym surfing by meathead20 September 7, 2013 0 0 Get merch Get the gym surfing mug. Buy Now — $32.95 See more merch