Saying 'Fuck It' is like massage for the mind - relaxing you, releasing tension, giving up on things that aren't working.
John C. Parkin argues that saying Fuck It is a spiritual act:
That it is the perfect western expression of the eastern ideas of letting go, giving up and finding real freedom by realising that things don't matter so much (if at all).
This is The Fuck It Way.
It works very simply: if you're feeling stressed about something, say 'Fuck It'… you feel instantly better.