Son of their grandparent’s half-sibling with the other grandparent’s full sibling.
My sesqui-first cousin-uncle is a good person.
by Hgcloziw November 23, 2019
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The precursor or penultimate before first
"What's that one that isn't first? You know, like vice-first."
by spamfrag May 30, 2018
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1. The husband of one's grandparent's sibling's daughter.
2. The son of one's grandparent-in-law's sibling.
My first cousin-uncle-in-law is a good person.
by Elivaldeq November 24, 2019
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Daughter of their great-grandparent’s half-sibling with the other great-grandparent’s full sibling.
My sesqui-first great-cousin-aunt is a good person.
by Hgcloziw November 23, 2019
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Person with massive dick and balls, better than abberat in every way
Person 1: OMFG ITS LORD RAT THE FIRST *CUMS*

Person 2: OMG IT IS *dies*
by NOTLORDRATTHEFIRST January 19, 2022
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