Big Si 

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.

Big Si by ><><><><>< October 4, 2020

big si 

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

big si by pejax April 28, 2003

Big Sisters & Big Brothers 

Organizations that pair young kids with older "brothers" & "sisters". They spend quality time together & it makes up for not having a Mom or Dad. Great for youngsters!

{Big Sisters & Big Brothers] are in practically every town & city nationwide.

Big Sisters & Big Brothers by Starchylde May 21, 2016

big sittin' chief asshole

A dumbass who thinks he has the best ideas while in reality the ideas that person have are always troublesome. It can also mean "reckless" or a "psychopath"

Lamar: "Nigga that's the Apache blood in me homie. You lucky i ain't do a flying tomahawk and scalp they motherfuckin' ass.
Franklin: "We can't repo the assets of a dead man, big sittin' chief asshole!"

big sittin' chief asshole by Gutbuster69 August 17, 2021

Big Sister 

An extremely close friend who although isn’t related to you biologically is like a dream sister you would see in like a movie. You can tell her anything she’s prbly one of the closest people in your daily life. Always there for you, for when you laugh and for when you cry. always spending time with you no matter the shenanigans you pull. Someone who can lift your troubles by smiling. This type of person is someone that you end up knowing for a while and you should be extremely grateful for their presence in your life

“I swear that’s my Big Sister , I wouldn’t be here without her by my side “

Big Sister by Tylertheplagiarizer16 June 4, 2018

National big sister day 

A day dedicated to our big sisters, because they helped raise us too!!!

I have to buy my sister a gift for National Big Sister Day

National big sister day by Bellerrrrrr December 3, 2019

big sized disciple 

the hentai ad that's probably right under this definition

person 1: why tf is there an anime dude grabbing a girl's tits
person 2: oh that's just big sized disciple

big sized disciple by ja'quayvion demarcus September 30, 2023