Green’s Dictionary of Slang

betrayed, informed against.

1791		H. Lemoine ‘Education’ in Attic Misc. 116: The mots lament for Tyburn's merry roam, / That bubbl'd prigs must at the new-drop fall.
1812		‘Architectural Atoms’ in H. Smith Rejected Addresses 92: The dustman, bubbled flat, / thinks ’tis for him, and doffs his fan-tail’d hat.
1824		‘Sonnets for the Fancy’ in Egan Boxiana III 622: [as 1791].
1977		G.F. Newman Villain’s Tale 39: ‘You hear the Squad nicked him ?’ [...] ‘He was well bubbled up. S’what a lad who came in just ‘fore I went out told me.