Meaning
Two senses. To rob a place completely — 'dem tief out di shop' means they cleaned it out. And, more commonly, to slip away secretly and unnoticed — to 'tief out' of the house or a class is to sneak off quietly so no one sees you leave. The 'tief' (thief/steal) here gives the sense of doing it by stealth.
Examples
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Di bwoy tief out a school fi go a di river.
The boy sneaked out of school to go to the river.
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She tief out early before anybody wake.
She slipped away early before anyone woke.
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Thief tief out di whole storeroom.
Thieves cleaned out the whole storeroom.
Origin
From [[teif]] (steal) + 'out'; the stealth of thieving applied to slipping away or robbing bare. See [[teif]].
How it’s used
To sneak away unnoticed; or to rob a place clean. See [[teif]], [[ginnal]].