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1.
A relatively common disease of HIV positive gay men (rarely heterosexual women) who practice both receptive anal sex and oral sex ("ATM" sex) with multiple partners. The condition is characterized by an inflammed, fissured, atonic, and supporating rectum. Symptoms include diarrhea, sanguinomucopurulent rectal discharge, rectal pain and itching, and abdominal cramps. The cause is multiple concurrent infections of the colon and a traumatized rectum with intestinal parasites (worms), protozoans, bacteria, and occasionally fungi. The disease is contagious within the susceptable population of ATM practitioners and transmitted via the fecal-oral route.
He had gay bowel syndrome and he had to wear diapers.
by Doctor Pinhead September 17, 2006
 
2.
When your butt hole quivers from being reamed too many times; a resulting symptom from having sex in the ass too many times; can happen to either sex.
Doctor states: "I'm afraid you have gay bowel syndrome. Your anus is quivering uncontrollably."
by THE MOTHER June 08, 2006