A sexual fivesome, similar to a London Bridge (two dudes tappin two chicks doggystyle while those hos makeout) with the addition of a third man between the women, who simultaneously receives a blowjob and assplay.
shit dude i was middle post in a picket fence one time and hoo boy we were high fivin all UP IN that bitch
Really bad orthodonture (crooked teeth).
synononyms: British teeth, Mouth of Horrors.
She was a babe until she opened her mouth and showed me her picket fence.