What is Stein Auf?
1.
The band
Ich habe einen Stein auf meinem Tisch! (I have a rock on my table/ I have a stone on top of my table.)
Hey, Mann, Stein auf! (Hey man, stone on top of!)
See
2.
Lost and Found (band) was playing in Germany and wanted to say Rock on, in german, and they didn't know how to, so they said stein auf, until they were told they were actually saying "Stone on top of", and so they had to convince everyone says (in america) STONE ON TOP OF!!!
At end of concert, band would yell STEIN AUF!!!! (for rock on)