Meaning of the Sanskrit Word: kautuke

  kautuke—in great fun    Madhya 9.116, Antya 18.94
  kautuke—out of curiosity    Madhya 9.294
  kautuke—as a matter of course    Madhya 9.294
  kautuke—in great eagerness    Madhya 25.66

Can't find any compound Sanskrit words containing kautuke.