whopper

noun2

1. •
   (informal) Something remarkably large.

   • I’d gone out pike fishing, bless you, never thinking of a trout, and when I saw that whopper on the end of my line, blest if it didn’t quite take me aback. Well, you see, he weighed twenty-six pound. — 1889
2. •
   (informal) An outrageous or blatant lie.

   • Coming out with a whopper now. Rhapsodies about damn all. Believes his own lies. Does really. Wonderful liar. But want a good memory. — 1922