My wife and I saw a movie a number of years back, Waxworks, I think it was.  It was sort of a teenage slasher movie.  Anyway there is one scene where one of the guys tries to stop one of the girls from going somewhere the guy thinks is unwise.  So she says to him:

"I do what I want, when I want, dig it or Fuck off!"

So we decided then that would be our family motto:

"We Do What We Want, When We Want, Dig It Or Fuck Off!"

  The actual Latin translation is as follows:

Quidquid  volumus,  nos  agimus,
Whatever  we want,  we   do,

quandocumque  volumus  agere  id
whenever      we want  to do  it.

Laetamini  aut  scortamini
Be glad    or   be fucked.