Wiktionary
a. (context slang idiomatic English) a descriptive analogy of closeness. See like white on rice.
Wikipedia
White on Rice ( 2009) is a comedy film directed by American director Dave Boyle, director of Big Dreams Little Tokyo (2006), and starring Hiroshi Watanabe, Nae Yuuki, Mio Takada, James Kyson Lee, and Lynn Chen. The film had its world premiere at the 27th annual San Francisco Asian American Film Festival on 17 March 2009.
Usage examples of "white on rice".
Some guy would goof off one inch and Davenport would be on him like white on rice.
But you're luckyif we had landed in Myanmar, government investigators would have been on you like white on rice, and you could forget about leaving for days, maybe weeks.
You also haven't met any of the FBI types who will doubtless be hanging around like white on rice.
And no matter where you are, Lenny, I'll be on you in spirit, like white on rice!
The FBI had been on the Arab community like white on rice with wiretaps, informants, arrests, and interrogations.
But if you stay around here and start harassing the Soviets, the Feds are going to be on you like white on rice.