The Collaborative International Dictionary of English v.0.48:

Mischief-making \Mis"chief-mak`ing\, a.
   Causing harm; exciting enmity or quarrels. --Rowe. -- n. The
   act or practice of making mischief, inciting quarrels, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mischief-making
    n 1: reckless or malicious behavior that causes discomfort or
         annoyance in others [syn: mischief, mischief-making,
         mischievousness, deviltry, devilry, devilment,
         rascality, roguery, roguishness, shenanigan]