The fan nickname for Snivy, a fictional species from the Pokémon franchise that made its debut in the 2010/2011
Nintendo DS video games Pokémon Black Version and Pokémon White Version as
Pokémon species #495, serving as the Grass-type starter Pokémon for the Unova region.
This leaf-tailed Pokémon quickly gained significant popularity on
the Internet for its smug looks, hence the nickname. It's been called at times, "the new Mudkip", and "Smugleaf" became a sort of Pokémon variation of trollface. There were also references made about its design being similar to that of "Excalibur" from the popular anime series, Soul Eater.