It meant foul or bad rice, with that characteristic high-scented smell.
The "yourdictionary.com" has an example used to meat, but it´s no surprise it has gone to other culinary items. Since it has this meaning:http://www.thesaurus.com/browse/high/5malodorous
a. Slightly spoiled or tainted; gamy. Used of meat.
b. Having a bad smell; malodorous.http://www.yourdictionary.com/high#KdEqK8gI818CQt25.99
BTW, I myself had not seen "high" to talk about rotten/spoiled food.
Very good !