The seagull manager flies in, makes a lot of noise, craps on everything then flies off again leaving a big mess behind

a phrase chiefly used in northern England.

it is a contracted form of "it'll be reet", where "reet" means "alright" or "OK".

living your life according to "be reet" is the only way to find happiness in life.

Seagull-management, A manager who files in making allot of noise, shits on everything, then leaves.

The type of business where your boss hovers around the office, takes the good ideas for himself/herself, and shits on every other idea you have.