IDIOMS

all wet

(idiomatic) Utterly incorrect; erroneous; uninformed.

Example: 1852, Charles Dickens, Bleak House, ch. 59,
  When I came home, I found a common-looking person, all wet and muddy.
1965, "The Lull That Lapsed," Time, 28 May,
  The lull gave Johnson a chance to show such critics as Canada's Prime Minister Lester Pearson and Senate Foreign Relations Committee Chairman J. William Fulbright that they were all wet in arguing that a halt in the bombing might open the way to negotiations.