Meaning
A mild exclamation of surprise or dismay — a softened, minced form of 'Jesus!', much like 'Jeez!' or 'Gee whiz!'. It is often extended playfully to 'jeezam peas' or 'jeezam pread' precisely to avoid taking the holy name directly, keeping the shock decent. It belongs to the useful store of minced oaths — beside 'jeezam', 'rahtid', and 'backfoot' — that let a person register astonishment or exasperation without real profanity, and it bursts out at whatever is startling or vexing in the moment.
Examples
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Jeezam! Yuh frighten mi.
Jeez! You startled me.
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Jeezam peas, look how late it get.
Good grief, look how late it's gotten.
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Jeezan, dat expensive!
Gee, that's expensive!
Origin
A minced oath from 'Jesus', softened to 'jeezam/jeezan' (and jokingly padded to 'jeezam peas') so as not to say the holy name outright.
How it’s used
Mild and everyday; a euphemistic exclamation. Common padded forms: 'jeezam peas', 'jeezam pread'.