Abriviation for snap back
Usually found on Snapchat when a user wants you to snap them back

lil mad is like big mad but the opposite, you mad but not mad to the extent of pullin somthin

It means Snap back, referring to when someone says snap for tbh (to be honest) and they want one back.

in terms of snapchat, sb means ‘snap back’

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.

SB Means Sidebar. So if they post something they can use "SB" to say something else

South America/Spanish/South Carolina/Southport Beak - a form of cocaine originating from a specific location starting with S - strength may vary according to region