I always thought the term "shonky" meant something that is not what it is portrayed to be. Usually refers to cars that are clean and nice on the outside but poorly put together mechanically or when a mechanic has done a "shonky" job and it costs money to correct their mistakes. It also usually refers to "deals" which are too good to be true and have conditions and fine print built into them which are to your disadvantage.

Here we have Shonkymaps. I guess I'm too old fashioned (and too old) to get the "shonky' connotation out of my head. :-)