[First of all, I do not approve of name-calling on here. I just joined this site and will not continue here if I keep seeing this kind of behavior (where is a moderator, isn't that against the rules?). Everyone has their own opinion and has the right to say it without derision.]
About phrasing, I think that the bass part (other than a solo) pretty much goes along with the song. Any song has phrasing. That is, things like resolving back to the tonic chord after a progression, or going from verse to chorus, stuff like that. Then, there are kicks, rests, dynamics, and all manner of ways in which the song breathes. Phrasing is most noticeable in solos, though (listen to BB King). I think what is being referred to here as phrasing is actually more akin to articulation. Articulation has to do with how notes are played. Dynamics is part of it, markings such as "legato" or "staccato" are part of it, too. Also stroke markings for up and down. While it is a well-known fact that the "groove" is where it's at while playing, nothing will make the groove feel better than good articulation.
I have found that if I play with a light touch I can articulate better. I mostly play two-finger style on my picking hand, playing with a pick only once in awhile (and there's nothing wrong with that, it has it's place). But, to use the pick for reference here, when I play guitar I can articulate best with a light touch. Consider this, as an exercize, playing with a wide stroke as if you're gonna hit the string hard, except that when you go by you only hit it softly. I've seen drummers with good wrists do that to a cymbal. It's a bit trickier to get that feeling fingerpicking, though. If I just start a simple groove and play for about ten minutes non-stop on it, after awhile I begin to get in sync and can feel articulation. I think articulation is the single-most important thing any musician can learn to do well. Without it music sounds drab.
Find a groove, lay in it for a bit until you're in sync, and then try to alter it some as you go along, hitting notes differently, but staying within the groove's feel. If this isn't what you're looking for, well, maybe it's something in addition that will help in some other way.
Cheers.