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]V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
BBL Be Back Later (slang, Usenet, IRC)The Free On-line Dictionary of Computing (30 December 2018):
BBL(I will) be back later.