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When the hairline of a person is so low that their forehead becomes reclassified a "threehead". This also suggests that their forehead is only about three finger widths high.
"Boy's hairline is so low, he got a threehead."
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When three people have oral sex together in a circle at once.
Person A goes down on Person B, who goes down on Person C, who in turn goes down on Person A.
Bob, Jane, and Alice had a hot threehead.
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A dumbass
A worse insult then forehead
"Conner you fucking threehead" I exclaim to the now dumbfounded buffoon
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