When something causes your manhood to recoil into its shell like a frightened turtle, you are said to have IKP.
Causes of IKP include, but are not limited to:
- being pantsed
- getting caught by a parent while doing explicit things with your girlfriend
- getting slapped/kicked/tapped in the testicles
- having to dance with the DUFF
of a group
- stepping in the shower when there is no hot water