(n) a person suffering from an unknown number of sexually transmitted infections (STIs)

In 2006 Subaru officially changed the name of the Impreza WRX model to Impreza STI. Thus, a Subaru dealership would be expected to contain a large number of model STI autos. Given that public health officials have also recently introduced the term STI to accompany the more well known "sexually transmitted disease," or STD, the pun is a relatively young neologism.

When you eat dirt for the first time and leave your family to build a shack in the woods