bbl

from WordNet (r) 3.0 (2006)

bbl
    n 1: any of various units of capacity; "a barrel of beer is 31
         gallons and a barrel of oil is 42 gallons" [syn: {barrel},
         {bbl}]

from The Free On-line Dictionary of Computing (8 July 2008)

BBL

   <chat> (I will) be back later.

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

BBL
       Be Back Later (slang, Usenet, IRC)