SPROS
SPROS definition by Slang.net
This page explains what the acronym "SPROS" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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If you just saw your child enter SPROS in online chat, you may want to circle back to their computer. This acronym stands for "stop, parents reading over shoulder," and kids use it to tell those they're chatting with that their parents are in the room.
Most likely, the person your child is chatting with is saying something your child knows you wouldn't like. Thus, your child used SPROS to tell that person to SU. If you leave the room, this inappropriate conversation will probably continue, and you can return to catch your child red-handed.