It is the condensed form of "Shotgun-Anus" where when two guys are planing on having sex with the same girl and while they are working out the logistics one calls "Shanus" thus securing their right to dibs on her anus.
Andrew: "Wow Kourtney is looking really hot tonight!"
Brian: "Yea man lets tap that"
Andrew: "SHANUS!!!"
Brian: "Darn, I wanted to do her in the butt first!"
Andrew: "Sorry man, maybe next time"
Brian: "Yea man lets tap that"
Andrew: "SHANUS!!!"
Brian: "Darn, I wanted to do her in the butt first!"
Andrew: "Sorry man, maybe next time"
by Jane Doe Doe October 20, 2006
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