Phonetically, it is performed in such a way:
1) press the teeth together
2) Let out a "ch-" foundation
3) Hold the "ahhhhh" note for a long period of time with your mouth open, appearing as oblivious and ignorant as possible, with volume such that it attracts the attention of females, which may lead to "getting hot puss."
Cha' as an adjective.
Cha clothing (Hurley, AE, A&F, Pac-Sun)
Cha'ster (One who is cha)
Chamillionaire (a bad singer)
"Cha', I did"
(they start blowing one another)