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Eric Harris (one of the Columbine killers)' AOL screen name.

This was one of several screen names, all of which seemed to derive from the word 'reb', short for 'rebel', the mascot of Columbine High School. In this case, the 'domine' is based on the Latin 'dominus' for master.
Rebdomine made some Doom wads.
by Fetuskrieg February 03, 2004