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.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug