in the song 'where's my jumper' by sultans of ping there is the line
"i know a little latin 'man a cus man a kai'" what does this mean?

Are you sure fo the lyrics? 

I have found many other versions of "Where's me Jumper" lyrics. 

One of them, claims that the babble that the artsie-man tells him is
"manicus manicae" (which sounds exactly like that but has meaning in
Latin, though a bit silly/goofy: both are based on "manus", hand, one
means "handle" (but also "man eating???") and the other means
"sleeves"/"writsts"

I'm sure the lyrics are just phonetic as kai sounds more greek than
latin, but i'm sure the answer is a well known phrase translated