Another definition of Miami's own Rick Ross's slang term. Trilla is a combination of "true" "real" and "ill" (as in sick or cool).
Trilla is used to describe someone who is the ultimate in being true and real to people, as well as keeping stuff awesome and fresh.
Trill is also used and means the same thing as trilla.
"I can't believe how awesome ABDC is this year!"
"I know! It's filled with trilla's!"