A girl (or guy) who is so tight that kryptonite is required to penetrate and/or tap that.
or
A virgin
or
To emphasize how hot a person is.
"Oh man, that girl is kryptotite"
"I was with that hot ass girl last night. Let's just say she was kryptotite."
"Holy shit, she's kryptotite!"
To be declined entry into an establishment, usually a nightclub, mainly due to looking and acting like a bum i.e. being um-bongoed
Aww man, I got Coco Bongoed last night. I was wearing flip flops and stank of piss
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