The Secretary of Homeland Security -- Janet Napolitano.

A reference to George Orwell’s 1984 ( Big Brother ).
The biggest threat to our freedoms isn't Islamist or domestic terrorists -- it's the Department of Homeland Security and Big Sis!
by Alohacop November 27, 2010
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A sorority girl who is the mentor of a new sorority (statistic) member. New members zealously love their "big sis", and they usually proclaim their love by window-chalking "I LUV MY BIG SIS!!!" all over their car.
New sorority girl: "I love my big sis!! I love her, I love her, I love her, I love her, I love her..."

New sorority girl's boyfriend: "Uhhh..."
by jvarna5 January 29, 2008
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Reserved only for the saltiest of sea-dogs, the thiccest of gamers with all the hatred for minorities and none of the gamer fuel. He is a character known for gunning the monster energy drink and snorting creatine so he can get level 99 WC in RS3 (not even OSRS). He will offer you the monster energy drink when he first arrives, but will ALWAYS drink it all himself. He is the kind to stay up all night to complete their school assignment but end up jacking off 6 times exclusively to reruns of the first American Pie.
Wow did that guy just buy himself a negev? What a Big Si.
by ><><><><>< October 4, 2020
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well buggered beef attached to an eski lid and thrown into the sea as shark bait, often found washed up on bondi beach asking british backpakers if they want a job
hey man we better thow some big si out there before those white pointers steal all the waiters cloths
by pejax April 29, 2003
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a similar expression to ong except for big sis
word to big sis adira that pipe was crazy
by grandma india November 21, 2022
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