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A male who sits when he pees.
Nah dude, that guy is just a sinclair.
sinclair by Forest Knight November 1, 2010
Sinclair is basically the biggest dipshit you will ever meet.
Don't worry he is just a Sinclair.
Sinclair by BlG GAY BOl February 10, 2019

Sinclairing 

Sinclairing is the act of giving a blow job while doing blow in a government office.
Sinclairing was a big news maker for Marion Barry and his many hoes while in office but the Obama case really gave the practice a name.
Sinclairing by saharadryhumor December 26, 2014

Upton Sinclair 

A man who wrote the book titled "The Jungle" about an immigrant family coming to the United States to find work. Long , boring, annoying, story short, he saved the packing industry by writing about terrible work conditions and potential cannibalism in the U.S.'s industrial revolution. This is all good and dandy, but we should all remember him as the socialist asshole who ran for governor in 1934. After his after his "End Poverty in California" campaign, he lost. California, which was just as neutral as Nevada currently is, jumped on the band wagon for socialism, or at least the people who wanted this dickhead as governor did. This became a snowball of bullshit until it became California as the rest of the states know it today; a shitty, fascist, you-have-to-conform, SJW littered, pile of hot garbage.
History Teacher: 'Did you know Upton Sinclair wrote the book that saved you from eating other people?!'

Me: 'That's true, but did you know he was a socialist who was influenced by Huey Long, the governor of Louisiana who though we should "Share Our Wealth?"

History Teacher: 'Reallly? I never knew that! *Commie-ness Intensifies*

Aiden Sinclair 

Aiden is a boy who will never get a girlfriend and will be single for life
Aiden Sinclair is going to be single for ever.
Aiden Sinclair by Hiiiee kidd1222 November 3, 2020

Ty Sinclair 

Common misspelling of phenomenal bassist, Taylor "Ty" Synclair of the fictional British rock band "ShadowsForge".
Ty Synclair couldn't wait to get out of the sweat-soaked black jeans he wore onstage.
Ty Sinclair by Jena' Galifany June 11, 2006