when someone who has a tune infection regrettably shares it with you, thus infecting you as well.
Alvin: "wow, I've got that horrible Carley Simon song stuck in my head...you know the one that goes; 'you're so vein, i bet you think this song is about you', it's driving me crazy..."
Theresa: "wow...thanks a lot for the tune contamination!"
When one picks his/her nose and subsequently picks the remaining nostril with the same finger, therfore taking snot from one nostril and inserting it into the other.
When a man is having sex with two or more women and pulls directly out of one and penetrates the other without rinsing his penis or condom. Seen in many porn flicks.
Wow! That orgy scene had massive amounts of cross cuntaminationgoing on! I bet everyone's genitals rotted out after filming!
lets say you sleep with a girl who slept with a guy recently, which the guy very recently (days at most) slept with a super hot girl and may not have showered before he slept with the girl your about to sleep with.. so in a way you got some of the super hot girl by means of... CROSS CONVAGINATION
Dude,, yesterday I boned Brooke who slept with Justin like a week ago, and a day before Justin boned Brooke he was with Bridgettes fine ass.. you kno what that means.. CROSS CONVAGINATION