Green’s Dictionary of Slang

fife v.

[play on SE blow, i.e. the instrument + blow v.1 (1e)]

(US) to boast, to brag.

Show quotations
[US]Life in Boston & N.Y. (Boston, MA) 1 Oct. n.p.: Scott P— says he is not going to ‘fife’ about his drinking qualities in the future.