A term used to express extreme happiness or excitment. Although originally only spelled with two i's, more can be added on to convey a higher level of excitement. The term was initialy created by Foosh(circa 2015), and later on would be the inspiration, for the Yoii Clan.
Packy: yo bro i just fucked my brother

Rest of the Yoii Clan: YOIIIII
by ToastyJoe November 14, 2019
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Instead of saying "Oh my God, "What" or "No way" you'd say "Yoii"

"Kylie and Brooke are now dating"
"You serious?... Yoii"
by lad4lyff July 1, 2015
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A clan consisting of the Founder Galdfoosh, the Co-Founders Goonts, Mitcheleye, Jew, and MlgMatthew, and the Veterans Prac, Dorito, and Box. But there is one member who has their own tier in this clan which is Moobar in the Moobar tier. No members are listed because the member population will change.
Person one: “Hey you see that guy over there?” Person two “Yeah, what about them?” Person one: “That person is in the Yoii Clan!”
by Goonts April 7, 2019
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Like "yay", yoiy shows excitement and happiness.
by mehoiminoy September 29, 2020
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