What is Piss On My Leg, And Tell Me It's Raining?
1.
Disbelieving response to an attempt to mislead, equivalent to: "pull the wool over my eyes"
You tell me that you've worked as an airline pilot and a surgeon, too? Go on ... you'd piss on my leg, and tell me it's raining.
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1.
As lackadaisical, but to the extent that you could label the owner of the attitude a slacker.
He just didn't do it. Totally slacka..