Toasting hails from ancient Greece . . . it was a time when they drank a lot of wine . . . not necessarily good wine. It was dark and thick and had to be diluted with water . . . and it was often acrid and sour tasting.
To make the fermented grape juice more palatable, spices were added to improve the flavor and it was topped off with a slice of heat treated bread . . . tostare or toast to you non-Latinificiandos . . . to absorb some the acidity and mellow out the wine.
Before they drank they would symbolically make an offering of wine to their gods. With cup in hand, they would raise up their arms to the heavens and say a prayer . . . a toast. Afterwards they would drink their libation . . .
A side note . . . a libation is an alcoholic drink which is offered as a religious ritual.
3/4 Cup Tequila
1/2 Cup Blue
1 Teaspoon Lime Juice
4 Ounces Orange Juice
Mix the tequila, blue curacao liqueur, orange juice and lime juice in a 2-cup measuring cup, and pour over ice in a salt rimmed margarita glass.
No bread. Then bring me some toast!