Only applies to guys: when hanging out with friends, partying, clubbing etc.
"Men, your designated wingman is basically your dude friend/bouncer/back-up/advisor/partyboy/player. Usually a close friend. Is there to give you that prep talk, before you try to pick up that hot chick giving you the eye at the other side of the bar. To back you up when your new girlfriends ex is there to kill you. To give you the opportunity for the once in a liftime hookup. Is loyal and will back you up in any situation, although it is advised not to borrow money from your designated wingman
Rory: Alright guys, today is the day. I'm gonna ask Jennifer out to the movies at school today.
Tommy, can you be my designated wingman?
Tommy: Yea dawg, i got your back (may be accompanied by a handshake/knukletouch/pound)