The double chicken wing is a sexual act. It occurs when the male is on top, having sex missionary style. He then locks both his arms underneath the woman's knee joints, and pulls both of her legs up towards her head. In this position, both of her legs resemble chicken legs, hence the name "Double Chicken Wing." One added bonus for this position is that it ensures deep delivery.
"After the pool party I took this English skank up to my 300 baht room, and while I was shagging her, I administered the double chicken wing."