It means Snap back, referring to when someone says snap for tbh (to be honest) and they want one back.
Friends story: snap for tbh SB
Me: me
Friend: tbh you a stank hoe now SB
Me: tbh yo pussy smell like the Nova Scotia pier
by TIC-TAC TANGE March 18, 2017
Get the SB mug.
noun. (pl. same) also,S13
Comes from a Chinese words

Pronounces Sha bi,means "Stupid Bitch".
In fact, Sha = 傻(stupid),Bi = 屄(pussy).
If you play online games in China or chat with some Chinese lowlives you'll see it many times.
A is singing in the midnight
B: You are the person between SA and SC.
A: SB,watch your mouth!
B: STFU SB!
A: Screw your sister SB!

...
C: Look! Two SB are talkin bout SB!
D: WTF? Scientiae Baccalaureus ??
E: ...the World is full of SB !
by nobia May 30, 2010
Get the SB mug.
SB Means Sidebar. So if they post something they can use "SB" to say something else
I look soooo pretty in this picture 😍
SB: I know my hand looks crippled.
Get the Sb mug.
Abbreviation for "SO BAD!" Used when someone does something that is very dismal, or something that causes undesirable effects to someone happens.
CHOWDHARY: "I broke my ankle because I fell down the stairs."
CONG: "SB!"
by Kevin the Cardboard Box March 15, 2021
Get the SB! mug.
Soft block. When you block and then unblock someone so you don't follow each other anymore
Jane: I'm going to sb anyone who follows Ariana Grande
by ReddishBitch August 1, 2020
Get the sb mug.