A reference to the character of Boo Radley in the novel "To Kill a Mockingbird", a "Boo Radley moment" is when a person is astonished at the sight of something or someone excessively strange and/or rare.
(Seeing a recluse emerge from their home after a prolonged period of time)
Man: *stares blankly, mouth open*
Recluse: Having a Boo Radley moment, are we?
To stab another in the leg, particularly the upper thigh area with scissors. The word is derived from the action of the character Boo Radley from the great Amercan novel, To Kill a Mockingbird.