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MMOS is an acronym that stands for major make out sesh (session).
You guys won't believe this but I had a MMOS with my hot neighbor.
Multiple male orgasms. The act of becoming a literal sex god with such strong taint muscles that you are able to hold back ejaculation while remaining at the PONR, thus achieving multiple dry orgasms.
After doing some kegels I went from PE to MMO.