To my knowledge there is only one opening that black has the "explicit idea" or "theory has it" that black is supposed to castle queenside and that opening is the Scandinavian but other than that one are there any openings that also have the idea or theory that black goes 0-0-0?

Well the game of chess has black castling Queenside

Im talking about specific openings.

Black often castles queenside against the Bongcloud to reinforce the center against the onslaught of white's king.

whenever black wants to, if hes gonna pawnstorm the kingside.

I cant think of a general opening where black almost always castles queenside, even in the scandinavian black does o-o fairly often. But theres various sublines in general openigs where he 0-0-0 fairly often. One that i happen to think of right away is the Qe2 petroff

There are some lines in the sicilian where black delays castling, and often finds himself castling queenside in the end.

I'm sure there are, some examples being some lines of the sicilian (like the kan, though kingside is still the most common spot), more often in the french, the albin counter gambit.

The Nimzovich Defense (1. e4 Nc6) has Black often castling queenside.

Semi-slav Botvinnik variation, Winawer poisoned pawn, some sicilian lines like the Richter Rauzer and 6.Bg5 Najdorf (not often though), and the Albin counter gambit are a few that I can think of. It seems much more common for white to go long.

I guess I wasen't so crazy after all. Castling queenside for black IS indeed rare...

well it makes sense that it would be rare, since black doesnt usually wanna wait to long to castle being behind in devleopment, and it takes longer to castle queenside, also involing a possibly premature commital spot for the queen

I sense some wisdom in this simple observation...that basically brings my question to a close.

quite often in the french. 

Some Caro Kann variations I think ?

When it's prudent.

Not at all unusual in the French or Caro-Kann.  Also in some lines of the Queen's Gambit it is the best option. 

The reason it isn't more common is as much to do with 0-0-0 just being generally less common.  It takes longer to set up (one more piece to clear), and the King usually has to move to the b-file as a precaution, so it takes two extra tempi to get to the desired castled position than with Kingside castling.  That it is even rarer with Black, who starts the game half a tempo down, should not be surprising.

Yes, I have been doing some looking around in Caro Kann theory and have seen some compelling games where black castles long and then pawn storms the king side.

In some lines in the scotch meises