kif-kif bedeutet auf Englisch

birds of a feather▼(people having similar characters)
noun
[UK: bɜːdz əv ə ˈfe.ðə(r)] [US: ˈbɝːdz əv ə ˈfe.ðər]

much of a muchness▼(little difference between multiple things)
phrase
[UK: ˈmʌtʃ əv ə ˈmʌtʃ.nəs] [US: ˈmʌtʃ əv ə ˈmʌtʃ.nəs]

six of one, half a dozen of the other▼(two alternatives are equivalent or indifferent)
phrase
[UK: sɪks əv wʌn hɑːf ə ˈdʌz.n̩ əv ðə ˈʌð.ə(r)] [US: ˈsɪks əv wʌn ˈhæf ə ˈdʌz.n̩ əv ðə ˈʌð.r̩]