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.

Large, beautiful breasts that are keep well consealed and initially appear to be much smaller and less impressive than they actually are until unleashed.

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"