It can be a bird similar to the gull, but larger in size. In Colombia it is a metal basket filled with stone that is used as a filter wall to contain mass erosion processes. It is also a type of top hat.
In lunfardo he is a "pimp" , or also the "living boyfriend who abuses the bride's property" . It probably has its origin in the Portuguese voice gavião (" gavilán" ). It is also found as gabion.
GABION: Colloquially, large cup and wing hat.