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Immaculate Infection 

Contracting HIV/AIDS, herpes or any other STD while celibate.
Vagenda was shocked to hear from the nurse at the free clinic that she done got herself da clap again, even though she ain't been giving it up for no one, no how, for quite some time. Unfortunately, no one bought her Immaculate Infection explanation, not even her minister.
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immaculate infection 

immaculate infection getting an STD while swearing you are a virgin, never having sex before.
I must have got that herpes from a toilet seat, 'cause I never did the nasty before. She has an immaculate infection. And behold, Gabriel came down, and said fear not, I bring you tidings of a great burning, and you shall be a curse onto all men that sleep with you henceforth. And they shall call you dirty.
immaculate infection by St. Mary December 31, 2005

Immaculate Infection 

married heterosexual couples who claim they have no idea how they became infected with HIV
Jim and Jane have been together for 12 years and just found out they are both HIV positive. Both say they have no idea how they got it; it must have been an Immaculate Infection.

Immaculate Infection 

Catching COVID-19 despite having no apparent contact with someone who is positive.
Man, I have been locked in my apartment for weeks, but I somehow caught C-19. It was an immaculate infection!
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British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
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