An acronym for "Gooch Heat Index". Refers to the metric of warmth emanating from the perineum of an individual or individuals. While primarily applicable to the the female gooch, GHI is measurable within male members of the mammalian species.
Steven (while being spooned by Carol): Babe, is that you?
Carol: Yeah. Sorry, my GHI off the charts today!
Yorkshire term, originates from scholes village in Rotherham meening fat guy, sometimes the words iberdi aberdi come before to make the sentence complete