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technically a suffix meaning "flow" or "discharge", "the rrhea" is just a shortening of the word "diarrhea" (four syllables). it's as simple as that.
example 1:

p1 - "hey man, i think i've got the rrhea...i'm gonna go dominate your toilet."
p2 - "dude fuck you! go use your own toilet!"

example 2:

p1 - "i'll never eat at mcdonald's again."
p2 - "what happened?"
p1 - "i've had the rrhea for a week now."
by mouck August 22, 2008