Goon: What the fuck is this?
[Picks up a bowling ball hesitatingly.]
The Dude: Obviously you're not a golfer.
Walter Sobchak: Nihilists! Fuck me. I mean, say what you like about the tenets of National Socialism, Dude, at least it's an ethos.
Walter Sobchak: Shut the fuck up, Donny.
The Dude: Where's the fucking money, Lebowski?
Walter Sobchak: This is what happens when you fuck a stranger in the ass!
Walter Sobchak: Smokey, this is not 'Nam. This is bowling. There are rules.
The Dude: At least I'm housebroken.
Jackie Treehorn: Refill?
The Dude: Does the Pope shit in the woods?
The Dude: Hey, careful, man, there's a beverage here!
Walter Sobchak: You want a toe? I can get you a toe, believe me. There are ways, Dude. You don't wanna know about it, believe me.
The Dude: Yeah, but Walter...
Walter Sobchak: Hell, I can get you a toe by 3 o'clock this afternoon... With nail polish. These fucking amateurs.
The Dude: Walter, I love you, but sooner or later, you're going to have to face the fact you're a goddamn moron.
The Dude: My only hope is that the big Lebowski kills me before the Germans can cut my dick off.
Jackie Treehorn: People forget that the brain is the biggest erogenous zone.
The Dude: On you maybe.
The Dude: Yeah, well. The Dude abides.
The Stranger: The Dude abides. I don't know about you but I take comfort in that. It's good knowin' he's out there. The Dude. Takin' 'er easy for all us sinners. Shoosh. I sure hope he makes the finals.
The Dude: I only said I THOUGHT she kidnapped herself. You're the one who's so fucking certain!
Walter Sobchak: That's right, Dude. 100% certain.
Maude Lebowski: Do you like sex, Mr. Lebowski?
The Dude: 'Scuse me?
Maude Lebowski: Sex. The physical act of love. Coitus. Do you like it?
The Dude: I was talking about my rug.
Maude Lebowski: You're not interested in sex?
The Dude: You mean coitus?
Jackie Treehorn: Interactive erotic software. The wave of the future, Dude. One hundred percent electronic!
The Dude: Yeah well, I still jerk off manually.
Answer: Generally, he means that the boy, Larry Sellers, is disgracing his family (Walter has huge respect for the boy's dad, but considers the kid a dunce). Specifically, Walter is blaming Larry for his father struggling to breathe; that's Larry's dad in an iron lung in the background. Walter and The Dude become louder, more insistent and more vulgar, but the kid still blankly refuses to answer, and all you can hear is the iron lung pumping in the background. Frustrated because the kid isn't intimidated, Walter lashes out: "You're killing your father, Larry!"
Charles Austin Miller