In Sci-Fi, most notably Star Wars,
deflector shields are energy fields that could protect
starships,
battle stations, ground-based structures, and even armies from enemy assault. (Wookieepedia).
The term may also be used as a substitute for the word "condom".
Ben: Hey, Luke! I heard you fucked Melissa last night. Did you have protection?
Luke: U kidding? I
switched all power to the front
deflector shield.
