The top value of the stack is deconstructed into a bit array. Each element in this array is complimented. That is, if it was a one, it's turned to a zero, and vice versa.
The effect is really quite interesting. The sign of the number changes, and its value becomes significantly different.
would be -1 I believe.
is -4294967231 I believe.
All values are me working from memory, but you get the idea.