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1.
When one sick individual in a couple just can't keep his/her mouth off their gf/bf/fuckbuddy, passing on the virus that they will eventually get back from said gf/bf/other, creating a vicious tennis-like volley of sickness. The world must know.
"TAG, YOU'RE SICK!!!"

"eww guys, stop playing sick pong."
by 2randomwenches April 15, 2010