"Self tanning" refers to the process of using a product (such as a lotion, spray, or mousse) to artificially darken your skin so that it appears tanned, without actually being exposed to the sun's rays. Full definition
The biggest problems with self tanning with and sprays, gels or lotions are the inevitable streaks, uneven color and the dreaded orange hue — but. (thefashionablehousewife.com)