Entry from British & World English dictionary
Definition of blag in English:
verb (blags, blagging, blagged) [with object]
1Manage to obtain (something) by using persuasion or guile: they blagged two free tickets to France 1.1Manage to obtain (private or confidential information) by impersonation or another method of deception: they were often able to hack phones because they had blagged phone numbers and passwords (as noun blagging) blagging is an offence under the Data Protection Act 2Steal (something) in a violent robbery or raid: I could lie in wait and blag her fur coat
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1An act of using persuasion or guile to obtain something: raising the £6.5 million had been either a heroic achievement by selfless, dedicated humanitarians or the blag of the century 2A violent robbery or raid.
late 19th century: perhaps from French blaguer 'tell lies'.