Cochrane Gambit. The Dragon isn't a garbage openings
your favorite garbage opening

Sometimes I bust out the 9. g4 Bxg4?! Dragon. Definitely refuted but impossible to handle in blitz without pure prep.

I'm fond of the Blackmar-Diemer Gambit, which I wouldn't call garbage though it is disreputable.I was a kid in Florida when Anthony Santasiere was a force in Miami and proselytized for the BDG as a romantic opening.
If Black plays reasonably -- solid but not cramped -- it's hard for White to show much for the pawn. But if Black's attention wavers, White can whip up a pretty nice attack.

It's hard to see the Smith-Morra as a garbage opening when IM Marc Esserman has been regularly trouncing people with it on up to GM Loek von Wely, once a top ten player.
Likewise the Cochrane Gambit, which was played by Topalov against Kramnik in 1999.

Well, garbage is probably a relative term -- like calling players 100 points below you "patzers" or "losers".
I thought ih8sens's comment provided a good guideline for garbage: "Definitely refuted but impossible to handle in blitz without pure prep."

Then there are lines like 1.h4, which most players would agree is garbage, but nonetheless is a Nakamura weapon in bullet.

I occasionally play the Polish opening...for the novelty. It generally works fine. Many are inexperienced in it, and it "throws them off". But I never use it against a strong competition.

Then there are lines like 1.h4, which most players would agree is garbage, but nonetheless is a Nakamura weapon in bullet.
Sometimes I will play either a4 or h4. Often I play both...one and then the other. I do this when I play a lower rated player. Not to mock them, but to give them a handicap. In an OTB game, I would spot them a R.
Latavian Gambit or the crab opening against new chess players