A euphemism for an extremely hot, or well endowed (large breasted) female who has honored a warehouse or warehouse like business with her presence. Door 5 is merely a cover so one can announce it freely to other workers without being suspicious.
Female enters
Intercom: Uhh Carl there is a Door 5, front desk
by Corey Thomas Laurin March 16, 2008
Get the Door 5 mug.