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Nice work if you can get it
Sarcasm Potential
The phrase is often used sarcastically to comment on a job that's unattainable or unrealistic for most people. 
Cultural Reference
This phrase may relate to show tunes; originated from a popular song in the 1930s from the musical 'A Damsel in Distress'. 
Colloquial Context
Use it in casual conversations, as it may be too informal for official or serious contexts. 