A 187 is a code in certain police jursdictions for a homicide. The term is used by a recent 911 caller who states she intends to whack her direspectful, car stealing son. On a tape of the call, played on The Howard Stern show, she says, Ya'll better get someone out here quick 'cause I'm gonna do a 187."
As a general slang term it could likely be used as, "Yo...don't make me 187 you...I'll mess you up!"
by greengoblin04 April 27, 2009