It all has to do with the vests you have
https://steemit.com/steemit/@oneshot/what-are-you-on-steemit-red-fish-minnow-dolphin-orca-or-whale

I just learned the term and phrase two weeks ago after repeatedly seeing it mentioned in posts.
Never knew of it

you go here https://steemdb.com/@insertyourname and it tells you how many 'vests' you have