This is miching mallecho; it means mischief.
Hamlet. Act iii. Sc. 2.
Ham. Is this a prologue, or the posy of a ring?
Oph. 'T is brief, my lord.
Ham. As woman's love.
Hamlet. Act iii. Sc. 2.
Our wills and fates do so contrary run
That our devices still are overthrown.
Hamlet. Act iii. Sc. 2.
The lady doth protest[138:1] too much, methinks.