Refers to an extensive STD test given to a person who has had more than their fair unprotected sex with a wide array of risky partners. Implies that the person seeking the STD test has had way too much risky sex with the wrong kinds of people that they are more than likely rotting on the inside and need a team of skilled technicians to remove the mess.
Bob - "I got totally wasted and took home two strippers last night."
Rick - "Are you crazy? You better go get a chinese drywall inspection before your junk falls off."