What does C15 mean?

C15 meaning in Urban Dictionary

A code made use of, often by dudes, whenever a nice-looking woman(women) is(are) somewhere nearby therefore the other dudes have to be notified without alerting stated appealing woman(women) that she(they) is(are) becoming observed.This is generally utilized in an office environment, in a retail string outlet within the loudspeaker or in blended organization.