Useful acronym for Small Penis Syndrome which can also stand for shitty pitiful slut if need be (example: the receiver is a female orc). Use in moderation.
SPS is a an abbrevation of "Small penis syndrome" and is used to describe people that have a small penis. These people take out their small penis frustrations on others. Usually you can find these people in IRC chat, Discord, Online games, or anywhere anonymity is high.