An increment of measurement in Morristown New Jersey used by the African American youth. The scientific measurement of a "bootyass" amount is still unknown but it is assumed to mean "many" or " a lot".
Not a phrase one uses unless you are trying to make a point, like how frustrated you are that the bike you once owned was stolen so much you no longer have it.
Usually used when one is talking very loudly, enough for other pedestrian tourists to overhear your situation and laugh at your interesting slang term.
Frustrated NJ Girl: I had a bike once, but they stole it bootyass times!!
NY tourist: wow, you'd only hear someone say that in Morristown New Jersey.