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1.
A word made up by Rammstein that means "whatever you want it to mean".
Girl: Are you going to the shops tomorrow?

Boy: Bückstabü

Girl: You're a Bückstabü!
by Ruski Esplin April 14, 2011
 
2.
A word made up by the German metal band Rammstein. They've never given a proper explanation of what it means, but its probably made of the two words Bück (=bend over) and Stab (=rod). And if you combine those two words, you got R+ in a nutshell...
Boy: Bückstabü?
Girl: Oh no, you didn't!
by Bjeffmeis September 10, 2013