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1.
completely, quickly, and/or enthusiastically. Usually preceded by "on it..." Similar to "like white on rice," etc.

Used in expressing eagerness to do or participate in some activity or project.
Bob: Want to go to my sister's wedding? Open bar.
Joe: I'm so there. I'm on it like dots on dice.

Bob: I need the prints done by 1pm. Are you doing them?
Joe: Like dots on dice.
by g_transcribe October 01, 2009