Green’s Dictionary of Slang

flummer v.

[backform. SE flummery, empty flattery, nonsense]

to flatter, to charm for a particular purpose.

[UK]Foote Mayor of Garrat in Works (1799) I 181: No flummering me: I tell thee, Matthew, ’twont do.
[UK]F. Burney Evelina (1861) 59: Do they spend all their time in flummering old women?