It stands for Wildland urban interface that translates Wild Urban Interface. It is a corporation that helps firefighters (FEMA). It establishes resources to prepare the population in its response to the presence of forest fires. It tries to protect both the population and the infrastructure.
WUI acronym for anglilicism while under influence , or walking under influence or writing under influence . It means you are under the effect of caffeine, cocaine, heroin, valium, base paste, some amphetamine or any stimulant.