To be very happy.
Someone who is content and which shows on him.
Although the job does not pay very well, she is as happy as a clam there.
The students were as happy as clams when they heard that the teacher is not going to be coming in that day.
He always does his work on time, no wonder his boss is as happy as a clam.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.