Phonetic alphabet 'meanings'

Hey, ive just been wondering about something about phonetics
on things like flight sim, and when people are doing radio practise at the ATC... they sometimes say a phonetic like it has a meaning. for example 'tell traffic controller if you have quebec' or saying 'charlie charlie' means 'everyone'
has someone got a reference for what the phonetics mean. i know the phonetic language as i learnt it at lunch on friday, but i dont know the meaning behind the words
ive googled but to no avail
cheers
on things like flight sim, and when people are doing radio practise at the ATC... they sometimes say a phonetic like it has a meaning. for example 'tell traffic controller if you have quebec' or saying 'charlie charlie' means 'everyone'
has someone got a reference for what the phonetics mean. i know the phonetic language as i learnt it at lunch on friday, but i dont know the meaning behind the words
ive googled but to no avail
cheers