I've seen this used in business names in Sosua, e.g., "El Flow" and the now defunct "X-Flow" and in entertainers' names.....is its meaning similar to "rap" or something like that??????????? 
A friend commented on a pic of mine in FB
"Una morena con flow"
So obviously, something great
SHALENA
P.S. seriously, its the equivalent of "swagger" in AA Ebonics.
Shouldn't this thread be in the Spanish 101 forum?
Flow just means style...as in "the height of fashion"