Metaphors - Like White On Rice:
Notes on Definition:
The expression, "to be on something like white on rice" is a simile that expresses an intensity in the 'focus' or 'commitment' towards something. This adds a more metaphoric impact towards the thing that you are committed or focused on, making it a more colorful expression. (no pun intended)
This slang-ish idiom derives from the fact that rice and it's color are inseparable, and are 'as one and the same', in addition implying that it would be ludicrous to think that a different scenario could exist.
Usually this expression is used with a playfully sarcastic or facetious undertone, but is a common-use expression that can be heard or read in books, radio, television, and everyday communication.
This expression is used as a 'set phrase' response. For example:
I'm on it.
I'm on it like white on rice.
I'm all over it.
The phrase could be used in response to sentences like:
Johnny, do your homework tonight.
There's beer in the fridge if you want one.
There's a 50% sales on everything at Walmart this weekend.
Go talk to the blonde sitting at the other end of the bar.
Of course an expression of this type can get a little bland, so there are many colorful variations. I've listed some below. Use at your own discretion.