Of poor or low quality.
That work he did was so shonky, I can't believe he actually put his name on it.
Not to be confused with "Wonky", which means much the same thing, but typically refers to structures, such as buildings, walls, etc.
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Τα e-mail στέλνονται από τη διεύθυνση email@example.com. Ποτέ δεν θα σε σπαμάρουμε.