As in Konglish, meaning the literal act of dying due to lack of ventilation (especially in a car or restroom).

Koreans will leave windows open even in the dead of winter to avoid the ugly specter of fan death. Ironically, when they go through tunnels they close the windows, selecting the lesser of two evils.

The Korean government has statistics for the number of fan deaths that occur each year. Some theories posit that these deaths are actually the result of domestic violence, which the government denies.