screw the pooch

screw the pooch

vulgar slang To make a very serious, grievous, or irreversible mistake; to ruin something or cause something to fail due to such an error. I'm sorry, boss, I really screwed the pooch this time. Do you think we can get the clients back if I explain that it was all a misunderstanding because of me? This operation depends on you, so don't screw the pooch!
See also: pooch, screw