An STD incubator. Someone who has had so many sexual partners that he/she has or has had multiple STDs.
Mike: "Dude look at that hot chick over there!"
Todd: "Stay away from her! She's at the health clinic every week! She's a stinkubator!"
Tammy: "Damn! He's had genital herpes, genital warts, AND chlamydia! He's a stinkubator!"
The space between the bedsheets where farts ripen and mature
After a dinner of white navy beans and turkey, my wife and I went to bed and created a memorable stinkubator under the covers with several hours of flatulence.