(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.
A-"That Gary is a beast-last night he went to three clubs, took home two girls from each and went raw on all of them."
B-"Gary is a friggin Subaru Dealership."
A-"Britnay Terple has had more sexual partners than there are chemical elements."
B-"Terple Subaru is open for business."