This Seth figure is released by Funko in their POP! x Superbad vinyl figure series.

Funko POP! is a crossover vinyl figure series by Funko and other famous franchises such as Disney, Pixar, DC Comics, Marvel Comics, Star Wars, Simpsons, South Park, Uglydoll, etc. Each POP! figure is about ~3" to ~5" tall and crafted in a Japanese anime/manga super-deformed style (NOTE: due to the unique design of each character, the actual size of the figures may be smaller or bigger than stated).

The POP! x Superbad series features characters from the 2007 comedy film that follows two High-school seniors, Seth and Evan, who have high hopes for a graduation party: The co-dependent teens plan to score booze and babes so they can become part of the in-crowd, but separation anxiety and two bored police officers complicate the pair's self-proclaimed mission.