slang 50
It is a slang of thieves and scammers used in English-speaking countries that, as in most cases, extended to popular use. The etymology is not clear, but it can come from a sling deformation ("throwing a stone with a slingshot"), as the effect that your words produce. See lunfardo .
Like 0
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list