monkey around with sth 
phrasal verb with monkey 
 informal disapproving (US also monkey with sth, UK also monkey about with sth)      
 胡乱触摸;随意改变;随意恶劣对待
to touch, change, or treat something in a careless or harmful way
  They shouldn't start monkeying around with the Constitution. 他们不应该随意改变宪法。