A "thin spatula" refers to a cooking tool that is long and flat with a narrow, thin blade. It is used for flipping and turning delicate food items, like pancakes or eggs, without damaging them. Full definition
While the cake is still hot run a knife or thin spatula around to loosen the sides of the cake from the pan. (mommyskitchen.net)
With a very thin spatula, check under the first one of two to see how they are cooking. (responsibleeatingandliving.com)
Once the first side is golden brown, use a very thin spatula to flip over to the opposite side again cooking until golden brown. (simplylivinghealthy.org)