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
Get the shanusmug. Did u know ur shanu?
by 🦋💙💙💙 January 23, 2022
Get the Shanumug. 
Shanu shahi a person who can do anything.
They are always single. They have so much of attitude but they won't show to everyone
They are always single. They have so much of attitude but they won't show to everyone
by Iam the only one November 23, 2021
Get the shanu shahimug. 
Guy 1 - Bro did you fuck that Chick last night?
Guy 2 - Yeah man her ass was like throwing a hot dog down a hallway.
Guy 1 - oh no shanus syndrome
Guy 2 - Yeah man her ass was like throwing a hot dog down a hallway.
Guy 1 - oh no shanus syndrome
by Banga81 March 9, 2015
Get the Shanusmug. It's all about the Shanus.
by The chocolate deer April 23, 2016
Get the Shanusmug.