You can always invent your own swearwords.
Or borrow from Battlestar Galactica (Frack!) or Nodwick (Krutz!) or even The Stainless Steel Rat ("What is this, cagal your buddy week?" "It's always cagal your buddy week.")
Or borrow from Battlestar Galactica (Frack!) or Nodwick (Krutz!) or even The Stainless Steel Rat ("What is this, cagal your buddy week?" "It's always cagal your buddy week.")