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when the man, who has diarrhea, is given a blowjob by his spouse. the spouse gets sick and starts to barf into the toilet. the man then gets sick because of her barfing and starts to barf into the sink.

soon all of the liquids mix together and create a swirly composure
"dude i experienced my first Swirly Blowdown last night"
"how'd you like it?"
"mann, it was SICK!!!!!"
by chrisachissa April 13, 2010
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