siesmick 

slang term for a sister or other friend

"Siesmick, where were you today? Momma didn't know where you went."

siesmick by Jamie "pisstang" Smitty December 16, 2003

sismick 

of or relating to the sign of devil

Guy 1:Yo dog look at that bamf sismick
Guy 2 : wtffff hes got 12 foot horns coming out his head

sismick by frisky moustace & vaccum belly January 1, 2007