Top Definition
OMMFFG is short for Oh my mother fucking fucking god.
I'ts an outburst uttered by nerds when they are COMPLETELY outraged by somthing or someone. Wehn OMMFFG is mentioned one knows that were talking serious business
OMMFFG they disbanded the immortal blades (a legendary AQ-clan)... Die wallo!
by bensunq December 18, 2005

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