Ahhh, the lure of Dive Bars, augmented by years of throwing Darts..
Well, home above all homes would be the good ole Father's Too (now called PJ Kilroys - I was there for the, uhh, transition) on Beacon just outside of Kenmore.
Not only did I (1) imbibe there frequently, I (2) shot B then A league darts (Team Too Drunk), I also (3) worked the door there for a few years. Almost quitting when Glen Foley was buying drinks for his O'Line after beating N.D. (best way for a BC Athlete to get hammered and not get caught? Go to a BU bar). I had a good bit to do with a lot of the dart plaques up on the wall. Most of my roommates worked and/or shot darts there. Of course after closing for the night, a stop at Riley's Roast Beef for a Suicide Sandwich was in order.
Any place that would have Mr Butch call it home was a dive bar. Anyone remember Mr Butch? If you did Kenmore in the 90s, you knew Mr Butch.
Home, home town: Old Mill Cafe, East Dedham
Honorable mentions frequented:
Gerlandos - Brighton, worked there too. (new location, shot darts at old brick location)
Wallabys in Newton, not a dive bar per se but a home for Mushes - Any Moushes here?

Smaxies II
Additional Dive bars, dart related:
What TDF said about Lynn. We would hit some of those when playing City finals (we were often in city finals).
Allston/Brighton:
Silhouette
Murphys Place
Fathers First
Great Scotts (upscale for us)
Hapers Ferry - awesome blues club
Linwood in Fenway
Brookline:
Scary Anne's
Cambridge:
Bow & Arrow
C.P.S.
Joey Macs ( or was that Somerville?)
Somerville
Rosebud - eh Patrick?
Virgies
Everett
Chalet Club
Parkway Pub
Dot:
Upstairs Downstairs
Centre Village (home of the Irish Flyers)
Southie:
Peter - I'll echo Triple O's in Southy and raise you Quiet Man's Pub
Worst dive bar I can't remember the name
Malden
Honey Fitz
Holbrook
Matt's Villa
Quincy:
Dee Dees
Cagneys
Washington Tap
Hottie Patrols:
Daisey Bukes
Beacon Hill Pub
Crossroads
Back Bay Pub
Maxwell Jumps