Acronym standing for Randomly Angry Male Syndrome.
Occurs in mostly adolescent to mid-20's males, causing fits of rage, outbursts, general anger, etc.
Caused by a variety of stressors on the modern male, such as stupidity of others, stupidity of society, general bullshit, and almost anything that can be seen as an annoyance.
There is no known cure.
Bob: Hey George, did you see Jim go ape-shit on that waiter? What's up with him?
George: Its probably just R.A.M.S., Bob. Sometimes the world just gets to guy.
Jim: (screams indecipherably in rage)