Definitions of turn on:

• verb:   produce suddenly or automatically

  Example: "Turn on the charm"

• verb:   become hostile towards
• verb:   cause to operate by flipping a switch

  Example: "Turn on the stereo"

• verb:   get high, stoned, or drugged
• verb:   cause to be agitated, excited, or roused
• verb:   stimulate sexually
• verb:   be contingent on