The study and/or theorizing of W.D Gaster from Undertale and Deltarune.
Someone who participates in Gasterology is called a Gasterologist.
Someone who participates in Gasterology is called a Gasterologist.
Casual UT/DR fan: Why do people say Gaster is green?
Gasterologist: You wouldn't know, you don't know Gasterology.
Gasterologist: You wouldn't know, you don't know Gasterology.
by Flibzy April 10, 2026
Get the Gasterology mug.by rogangsterologist May 15, 2020
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A science based on an ancient system of divination, consisting primarily of pulling a horoscope out of one's ass.
During my first year at gastrology school, I mostly studied the signs of the zodiac, creative composition and ass-based fortune telling.
by Jesse and Annie July 23, 2007
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