1. the background sound some one can make when a person gets busted, slapped, "dissed," or humiliated
2. The word you can use instead of owned, pwned, or burned, also it sounds like a slap in a comedic humor.
( Shh-pLah-Cow )
Guy: Whats up wit the gay outfit?
Friend: whats up wit the dirty face?
Guy: Your mom didn't complain last night!
Guy's Friend: SHPLAKOW!!!