An all purpose phrase appropriate for any situation. Verb, adjective and occasionally noun - it can be used as a greeting, to acknowledge success or failure. Most commonly used as an expression of delight.
Can be adapted to 'brown rolling', 'rolling brown' or 'brown roller'.
Also has fecal connotations.
Some people imagine a six sided dice being rolled with the outcome landing on the brown-colour side.
I just got top score on COD - roll a brown.
That curry has ruined me.
You should roll a brown.