I've listened to the full thing and I only heard one word that echoes a few times but is then repeated through the whole track. It could have been "Rock it" but it wouldn't fit in with the mellow nature of the tune. Heard no other lyrics...
It's not really a song Mib. It's more of an ambient "groove".
There seem to be a lot of these in Germany. Just put together in the studio by sundry musicians.
It's a"chill-out" background music thing. I love them. This is nice. I just want to play along.
It doesn't go anywhere harmonically. I would guess the "lyric" is something random.