Los Angeles slang for someone who makes money by robbing, most commonly home invasions or "flocking." Although it seems its taken a new meaning on Urban Dictionary.
I'm a real flu flammer nigga I just hit the asian folks house in Westwood and prayed to their buddha.
In rugby: the name given to players numbered 6-7. These individuals are well known to be gentlemen off the pitch, but as soon as they step onto the pitch they become animals, tackling anyone who comes near them, and often starting fights.
'look at that tackle' 'he must be the flanker'
'any idea who startedthe fight?' 'probably the flanker'