You had me down twenty one to zip

Hi I'm a dutch girl trying to translate this sentence of a song by Robert Palmer, bad case of loving you:

"You had me down twenty one to zip"
"Smile of Judas on your lip"

Can anyone help me with a discribing in understandable english?

Thnx , Djoosje

A hot summer night fell like a net
I've gotta find my baby yet
I need you to soothe my head
and turn my blue heart to red

Doctor Doctor, gimme the news I got a
Bad case of lovin' you
No pill's gonna kill my ill I got a
Bad case of lovin' you

A pretty face don't make no pretty heart
I learned that buddy from the start
You think I'm cute, a little bit shy
Mama, I ain't that kind of guy

Doctor Doctor, gimme the news I got a
Bad case of lovin' you
No pill's gonna kill my ill I got a
Bad case of lovin' you

I know you like it, you like it on top
Tell me mamma, are you gonna stop?

YOU HAD ME DOWN TWENTY-ONE TO ZIP
SMILE OF JUDAS ON YOUR LIP
Shake my fist knock on wood
I got it bad, and I got it good.

Doctor Doctor, gimme the news I got a
Bad case of lovin'you
No pill's gonna kill my ill I got a
Bad case of lovin'you

smile of judas would be like the kiss of judas
the other I don't have a clue. try also the lyrics discussion thread