He went to Germany and visit TV Total almost 2 months ago. I didn't post the interview because it's not that interesting. But for this samba rap, it's another story. I can't help myself but loving it!
And here's the lyrics as usual:

[Eminem]
Here I Go,lyrical
I have no idea what I'm doing but I'm spiritual
On the microphone I tear you up in ste-re-o
I'm like the Grand wizard, yes I'm the Empe-ri-al
I have no fucking clue what the fuck I'm doing
But "Freifick, Muschi", your whole life is ruin
If you try to step to me your life's in jeopardy
Cause i will seek you out...

[Chorus][Stefan Raab]
Zucker im Kaffee
und Zitrone oder Sahne in den Tee
und dazu den ganzen Tag lang nur Amor
das ist wunderbar, señor

[Eminem]
Yes...here we go, break it down
I got the crown, I'm 'bout to take it now
Yo I got my man and he's on the guitar
And when it comes to lyrics, I go so far
Like a car that I'm driving, surviving of vivrin(?)
I'm alive, I'm like "Eye Of A Tiger"
And I kick it so..so fucking hard
Now "Freifick, Muschi", no disregard
Come on!

[Chorus][Stefan Raab]
Zucker im Kaffee (yes maan! yes maan!)
und Zitrone oder Sahne in den Tee (yes maan! yes maan!)
und dazu den ganzen Tag lang nur Amor (yes maan! yes maan!)
das ist wunderbar, señor(yes yes yes maan!.. yes man!)

Zucker im Kaffee
und Zitrone oder Sahne in den Tee
und dazu den ganzen Tag lang nur Amor
das ist wunderbar,señor

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This is what Paul Rosenberg posted on his blog about it:

O.k., so this one takes a little explaining unless you are German or for some reason you watch a lot of German TV. German comedian Stefan Raab has a late-night talk show on German television called TV Total. Em has appeared on the show several times, and each time Stefan tries to get Em to do some wacky TV Total style things.

Well yesterday was no exception... Basically, all we were told was that Em was going to do an interview with Stefan for an 8 minute segment, and then he was going to perform "We Made You" live. Simple enough, right? No.

See, Stefan came back to talk to Em before the show and they went over a few topics, then Stefan suggested that him and Em perform a samba style rap. Em, and everyone else in the room thought Stefan was being silly, and didn't take him seriously. Well, he was serious.

The crazy thing about the set on TV Total is that Stefan's desk and the platform where the guests sit that is attached to it moves from right to left and vice-versa across the stage. After 15 (not 8 mind you) minutes of wacky German humor, Stefan pulled the lever to move the platform to the right. Now, Stefan and Marshall were sitting with the band. Some more indecipherable German banter occurred and the next thing you know - BAM! Samba rap was born

I know that Em wasn't expecting to bust a samba freestyle with Stefan on guitar and chorus vocals, but that's what happened. Off-the-top, crazy ill German samba rap song in English and German. Yes, that just happened.