Duck soup American informal noun slang
Used to descibe something very easy to do or accomplish
Don't worry about the next task! It'll be like duck soup.
The job was duck soup for new workers.
Fixing the fence is going to be duck soup.
This phrase can be be used after "be" or "like".
People tend to like forbidden or illegal things just because they are forbidden or illegal.
He must have believed that stolen fruit is the sweetest, and he, therefore, cheated on his partner.