There is "Ex-Boyfriend Dummy" toy in next patch, but no "Ex-Girlfriend Dummy" = thats discrimination of Lesbians.
http://ptr.wowhead.com/item=144339/ex-boyfriend-dummy
"Use: Summon an Ex-Boyfriend Dummy at target location for 5 min. The punching bag acts as a target dummy while it persists. (30 Min Cooldown)"
"Because stabbing the real thing is illegal."