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1. O.M.S
(Open Mouth Syndrome) This is when the person you are currently making out with uses excess amounts of tongue, spit, and or slobber.
Friend: How was she last night?

Friend 2: Dude, total O.M.S. Pretty much terrible.

Friend: Oh know, that bad?

Friend 2: I needed an entire beach towel to dry my face off afterwards.
2. O.M.S
Original Mosh Starters known for stepping into any club/rave/bar/alley and creating moshes that eventually turn into riots.
Tell security that O.M.S are not aloud in tonight because there liable to goin too sick.
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