BOTL

Bra On The Loose

It means your bra strap is showing. Online jargon, also known as text message shorthand, used in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms. 

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See also : AMRMTYFTS  
NetLingo Classification: Acronyms and Text Message

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