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
by the most mythical of reindeer January 09, 2007
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.
by Nancy_Drew_Mysterious October 04, 2006

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