i think it is more of a passing teenage phrase. esp for boys..
hmm, ive seen before on tv.
the show was about to help obese ppl lose weight, so they hypnotise them n when they see unhealthy food (like burgers, fries, snacks), they will wanna vomit (i think they make them think its shit.) but they see veges n fruits they will gobble down..
but im not sure how true it is.. cos afterall, its on tv.....