bl a recntly begining msn abreiviation to give some varity rather than the very much over used lol
basicly bl= belly laugh
bl not lol!!
person1: blah blah blah this sentence is in no way funny at all!!
person2:lol
person1:that wasent funny
person2:oh well lol
person 1 : (sumthing reeli funny)
person2: BL!!
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