"Baby shark, do do do (3x)" (with clapping motion like shark's mouth
opening...)
"Mama shark, do do do (3x)" (clapping again, with whole lower arms)
"Papa shark, do do do (3x)" (with whole arms)
"Grandma shark, do do do (3x)" (with lower arms and fingers turned in to look
like toothless gums)
"I went swimmin', do do do (3x)" (with 'swim' arm motions)
"Lost an arm, do do do (3x)" (with 'swim' with only one arm)
"Lost a leg, do do do (3x)" (one armed 'swim' while hopping on on leg)
"Then I died, do do do (3x)" (I don't think there are motions for this. But
who knows.)
"I'm just kidding, do do do (3x)"
"I'm OK, do do do (3x)"

August 23, 1999. Posted by "Ze Monsta" to the alt.music.nirvana usenet group.

See here: https://groups.google.com/g/alt.music.nirvana/c/HyQGebpY89A/m/qupX1pBaebwJ