A meal, usually eaten at breakfast time, consisting of a quadruple vodka (four quadruple vodkas for the brave) and a ham sandwich. This was John Bonham's (led zeppelin drummer) last meal, hence the title. It can also be a verb as in "he John Bonham Specialed that ass, and now he's pukin'"
"I wanted to get hammered one morning so I had the John Bonham Special"
"I dared him to get a John Bonham special and he did"