SB means Snap Back.
The Full Answer
SB is a slang abbreviation that stands for Snap Back.
It is used on Snapchat to request that someone sends you a Snap back.
You and a friend will be on a Snapstreak if you Snap each other within 24 hours for more than three consecutive days.
Some people offer incentives in exchange for a Snap Back…
e.g. sb for a tbh…
or sb for a rate…
or sb for a line (similar to a tbh).
SB is also an abbreviation for somebody, which is used to refer to an unspecified or unknown person.
Where Would You See SB?
On Snapchat… and in texting… and chat… and on social media, such as Facebook… and Instagram.
sb to start a streak.
Happy Independence Day. SB with your pics.
When you post sb for a tbh and you’re waiting for one person to sb.
Other SB Meanings
Nike SB is a range of skateboarding shoes.
Stolen Base (baseball).
Sb is the symbol for the chemical element antimony.
Starboard (ship side).
San Bernardino, California.
Santa Barbara, California.
Special Branch (police division in the UK).