A sin boomerang is a woman of the attractive variety that is able to be recruited to acquire various objects of the self-destructive variety (such as drinks or cigarettes) from horny men typically in an environment in which imbibing is occurring. Upon acquiring the desired item, she then returns to her friend/friends to ration out the spoils.
"Dude, that party would have sucked without a sin boomerang. Those guys were being mad stingy with the Bacardi."
"Don't give that chick any cigarettes, she's definitely a sin boomerang."
"Don't give that chick any cigarettes, she's definitely a sin boomerang."
by BCKittyCat September 29, 2009