This means " Wont Be Long ", but it's just shorter to type.
*while driving your phone rings and it's an sms*
Her: I'm here :)
You: wbl
Her: ok, waiting
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White Bear Lake, also know as "Wibble"
Da nigga Ledin is from the WBL! Dont fuck with him!
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Just like wbu (what about you)
Wyd (what you doing)
Wtw (whatโs the word) etc
โYo bro Iโm doing somethingโ
โIght wblโ
โIโll lyk soonโ