fresh off the turnip

"Fresh off the turnip truck" probably is derived from the more popular phrase "fall off the turnip truck".
"Fall off the turnip truck" means extremely naive, uninformed, and gullible. (Often used in the negative)
形容人过份天真无知. 有负面含义.
"Fresh off the turnip truck" probably has same kind of meaning. It could mean you start up a new business and lack experience.
形容人刚刚开始新的事务. 譬如开一家商店,因为毫无经验,所以有些冒险.
fall off the turnip truck 与 fresh off the turnip truck 都是俚语.
fall off the turnip truck 较长用.
fresh off the turnip truck 较不长用.
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Hope this helps.
Cheers