Craigslist term for a phone number composed of numeric digits and spelled-out numbers. Many CL posters/spammers use this technique:

- to avoid autodialers,

- to prevent harvesting / resale of their phone numbers,

- to make it more difficult for flaggers to find their multiple ads by searching on their phone number.

Origin: Supposedly, prostitutes who use CL to advertise in multiple cities or spam / overpost in one location originated the technique.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.