Usually when a wingman or wingwoman brings thier friend a fuck buddy with no strings attached to the bar/party. ie... Free Shipping ... This girl or guy must be somewhat attractive. Your bar mate would do her or him but is with someone else at the present time. Free Shipping is best done when the "Shipee" is stoned, drunk or getting back at thier boy/girlfriend for cheating.
Scenario for Free Shipping...it's a stretch so bear with it...
3 people are out at a random pub...2 guys, 1 girl. Girl "Dora" and guy "Dick" who are dating go outside for a smoke or to score some drugs, leaving other guy alone. We will call him "Single Sam." The daters, "Dora & Dick", find a Cute Girl for Single Sam....
Single Sam: Alone at the bar staring at his coaster....
Dora & Dick: Smoking outside when Cute Girl asks for a ciggy...after pleasantries and small talk Dora and Dick find out Cute Girl is "On The Prowl."
Dora: "You'd like my friend Single Sam. He's just inside."
Dick: "I'll buy you a drink, Coke, X... if you shag Sam."
Cute Girl: "I could go for a roll in the hay...let me see this Sam."
Dick: Talking to Sam, "I found this Cute Girl for you. She's nice, cool and is willing to shag you. Totally Free Shipping dude. Hit me on my mobile in the morning with all the details."