This homemade vehicle is a contraption.
- The definition of a contraption is a strange machine, appliance or device used to do something.
A strange little bike that you built yourself to get you from place to place that looks as if it is going to fall apart at any minute is an example of a contraption.
Origin of contraption; from uncertain or unknown; perhaps con(trive) + trap, + -tion
Origin of contraptionPerhaps mock-Latinate blend of contrive and trap1.