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.