The comment is made because Donny is always coming into a conversation without knowing what is going on.
Also, we can infer that Walter is implying that Donny has no experience or knowledge of the topic at hand, hence, he is out of his element. I interpret this strictly as intended humor though, and think that we're just supposed to understand that this is but one of many times that Walter has cut Donny off and insulted him in the past (as he continues to do throughout the movie).
The Big Lebowski was released in 1998.
The Production Budget for The Big Lebowski was $15,000,000.
The Big Lebowski grossed $17,498,804 in the domestic market.
The Big Lebowski... he had "Bunny Lebowski" and a "Nihilist" floating in his pool.
Maude Lebowski (Julianne Moore) in Big Lebowski
The Big Lebowski
Theodore Donald "Donny" Kerabatsos
The Big Lebowski.
Lebowski
A rug.
Lebowski festival is located in Louisville, Kentucky. This festival began in 2002 as an annual multi-city festival and as a celebration for 'The Big Lebowski', the Coen brothers cut film.
The Big Lebowski was released in 1998.
The duration of The Big Lebowski is 1.98 hours.
The Production Budget for The Big Lebowski was $15,000,000.
The Big Lebowski was created on 1998-02-24.
Julianne Moore plays Maude Lebowski.
The Big Lebowski grossed $46,189,568 worldwide.