Peda is a very common informal word in Mexico and other Latin American countries that refers to a drunken spree or a party where a lot of alcohol is consumed. It's a colloquial term you won't find in formal dictionaries but is widely understood in everyday conversation.
In the song, the opening line "Quisiera morirme en una buena peda" (I wish I could die on a good bender) immediately sets a dramatic and somewhat self-destructive tone, highlighting the character's despair and desire to escape his problems through drinking. This word is key to understanding the song's raw and emotional narrative.
Ever been so heartbroken you just want to drink away the pain? Grupo Arriesgado's "A Traves Del Vaso" [Through the Glass] perfectly captures that feeling. Our singer is absolutely crushed, wishing he could "morirme en una buena peda" [die in a good binge] because loving her brought him nothing but problems.
He's at the bar, staring into his drink, and all he can see is her face. "A través del vaso yo miro tu cara" [Through the glass I see your face], he sings, admitting that his desire to see her won't go away. He's torn between wanting to find her and then regretting it, because her betrayal was the "decepción más grande que he tenido" [biggest disappointment I've had]. He even asks the bartender, "A los cuántos tragos me olvido de ella?" [How many drinks until I forget her?], revealing she left him "por unas monedas" [for some coins]. Ouch! Even though she wants to come back, he's firm: "mejor que no vuelva porque ya no quiero saber y de su vida" [better she doesn't come back because I don't want to know about her life anymore]. He knows remembering her kisses only hurts him, but through the glass, he still sees her and, like a madman, he still loves her.