When you think you have found an empty parking spot but it turns out there is a small car in it, that was hidden by the surrounding vehicles.
Right there, right there! A spot by the door! Oh, sorry, nope, there's a Geo Metro in there. Small car trick!
An inflatable sofa. One you need to blow up, hence blow + sofa = blofa.
Dude, don't sit down with your keys in your pocket, you'll pop my blofa!