What is the worst gambit?

The Hobbs Gambit against the Bird Opening
Black's only hope is that White captures the g5 pawn first and then the h6 pawn.
If White captures the h6 pawn, it leads to a very interesting position where

in practice, Black has achieved very good results.

No, it's probably Duras.

The Borg Gambit is probably losing on move 2, which must make it a good candidate as the worst gambit.

The worst gambit has got to be the Petrov's Defense: Classical, Damiano Variation, Kholmov Gambit

Actually this is a very decent way to play as Black, and there is no clear-cut way for white to reach even a tiny advantage.

My vote goes to either the From's Gambit or the BLackmare Dimer Gambit, with a close second the Tennsion Gambit and the ICBM. a strong 3rd would be the Englund Gambit!

The Coca-Cola gambit. I don't believe you if you got yourself into that situation, unless it was staged.

What about the Duras Gambit. Black sacrifices a Pawn to just uncover the Black King. Losing with White with this opening means Black is disrespectful.

king's gambit, danish gambit, anti reti gambit, etc

Danish is quite strong at lower elo actually

Kings gambit is also strong

You can turn this into Modern Defense: Fianchetto Gambit. Taking back the pawn after e4, g6, d4, f5, exf5 is Qxh5#