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.
דוא"ל יומי חינם
אימיילים נשלחים מהכתובת firstname.lastname@example.org. לעולם לא נשלח לכם דואר זבל.