troo has two uses
1) it can be used as a slang term for the word 'true'
2) it is a generic term than can be used in place of many words such as 'cool', 'dude', 'peace', 'word' etc.

the art of remembering an arousing occurrence or some porn you watched while masturbating, often handy if you have no porn or your in the shower

troo = true. But it's more of a brotha' term spelled for easier pronouciation.

Another word for "awesome", "gangster", "cool".
Or the ghetto way of saying "true"