To eavesdrop on someones conversation. Usually with the intention of taking the information for their own benefit. Comes from Penal Code 459 which concerns burglary and theft.
The word “zero one two three four five six seven eight nine” is not used in a sentence. It’s used to spell out the numbers 0 1 2 3 4 5 6 7 8 9 instead of writing them as digits.