screen door on a submarine

1. Useless, worthless

2. To cause someone to lose hope; To disapoint; Burst your bubble

1. I don't think she should be on our team. She's a screen door on a submarine.

2. (From the Venture Bros.)
Hank: Aww come on, let me at 'em, Brock! I probably know Judo! How many of those guys can make the same boast?!
Brock: No.
Hank: Why must you be the screen door on my submarine, Brock?

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about as useful as a screen-door on a submarine

Utterly useless
A waste of oxygen
Completely worthless
A waste of space
Devoid of any purposeful function on this earth
Something about as useful as a screen door on a submarine

"This screen door on our submarine is about as useful as a screen-door on a submarine."

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