Hey all,
I took a stab at the lyrics. As the Conchords continually tweak their songs, I can only say this is what I got...and it ain't perfect.

My ears aren't super, as you old-timers know.
Freaky
Bret: ah dah ah
Both: Freaky
Bret: You and me, me and you. Sensuality.
Jemaine: We’re gonna get freaky
Bret: We’re gonna go, me and you.
Both: Freaky
J: We’re gonna get freaky tonight. We’re gonna get freaky tonight.
Both: Freaky
J: We’re gonna take it to the limit tonight.
B: Ahh ah. (continues in background)
J: You didn’t know there’s a limit, well there is and we’re in it. Tonight. We’ll go beyond the limit. Then you’ll think, why was there a limit if we can go beyond the limit?
J: Gonna get freaky tonight. I’m gonna take the month of August off, just to get you off.
B: Sensuality.
J: Gonna remove all the stuff from the table tops. We’re probably gonna need a mop.
We’re gonna get freaky tonight, I said we’re gonna get freaky tonight.
B: Let’s take a photo of a goat and then float in a boat. Oooh and ??
I’ll take your body and cover it honey, then stick some money to the honey, now you’re covered in money, honey.
I’ll step outside on the ledge and push my ass against the glass. You can act like you don’t even know, babe.
I’ll take a cup and then I’ll put it on my head, and then be freaky with a cup on my head.
Both: I told you I was freaky.
J: Take it off.
Both: Would you ever leave me?
J: Put this on.
Both: I told you I was freaky.
J: Don’t look at me.
J: Let’s get freaky.
B: I’ll make two life-sized cardboard cutouts of the bodies and then pose them into sensual positions. I’ll paint the wallpaper pattern onto our naked skin, stand against the wallpaper and get off like chameleons.
B: I’ll get some leaves and pretend to be a tree. You can be a squirrel and store my nuts for me.
Both: I told you I was freaky.
J: Look at this.
Both: Would you ever leave me?
Both: I told you I was freaky.
J: Don’t look at me.
B: Fly so high in the sky, and see what love can bring. Steal my roommate’s pillow feathers and make some homemade wings. Gonna fly so high on erection pillow wings. Can you believe we fly…?
J: We’re gonna get freaky tonight, oh we’re gonna get freaky tonight.
We’re gonna take it to the limit of sensual delight.
B: Ooh.
J: We got a boat, we got a photo of a goat. We’re gonna get freaky tonight.
I got some gravy, I know we’d be the navy (?), there’s gonna be a party tonight.
We got some money, stick it on with some honey. It’s gonna be alright tonight.
Got some clips, let’s give them all a lift, cause there’s gonna be an eclipse tonight.