1archaic A vain or conceited man, especially one whose style of dress is ostentatiously elegant or fashionable; a fop, a dandy. Also sometimes without depreciative connotations: a suave, elegant, or well-dressed man.
2Frequently in form Jack Dandy. Brandy.
Recorded chiefly in dictionaries and glossaries.
Early 17th century; earliest use found in John Taylor (1578–1653), poet. From the male forename Jack + dandy, as a generic name for a dandy, with insertion of -a- in some forms probably after jackanapes.