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Study of cum, jizz, semen.
Could be from watching people masturbate so many times or pleasuring others until cum comes out.
Or in case of some girls, sucking dicks so many times, and so much cum is in her mouth that she could study it.
Sally is well on her way to a career in cumology.
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Cumology is the definition of someone who basically studies cum.
Friend: "Hey I heard you went to college, what did you study?"
Me: "Honestly, I studied Cumology."