a child of unnatural conception; generally defined as one whose parents (most likely the father) gave birth past the age of 50, hence the name -- the resulting pregnancy is most often associated with the use of viagra, because even aging, geriatric rocker-jockeys like to get their freak on too.
"Did you hear about David Letterman's 10-pound viagra baby? He's gotta be pushing at least 55..."

"Dude, Trevor's dad is like 70 and he's only 16, what the hell is up with that!? He must have been a viagra baby."
by STurner March 28, 2009
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