Green’s Dictionary of Slang

1. to harm; to attack.

1577		Misogonus in Farmer (1906) II i: I’ll bum fiddle thee, in faith! I’ll swaddle your skin!
c.1618		Massinger & Field Fatal Dowry (1632) IV i: romont: D’ee take me for A fidler? y’are deceiu’d: looke. Ile pay you. (Kickes ’em). page: It seemes he knows you one, he bumfiddles you so. liladam: Was there euer so base a fellow?
1623		Middleton & Rowley Spanish Gypsy IV iii: If he bum-fiddles me [...] and bids you with a pox send him more money.
1641		R. Brome Jovial Crew III i: I am sorely surbated with hoofing already tho’, and so crupper-crampt with out hard lodging, and so bumfidled with the straw.

2. to have sexual intercourse (with); thus bum-fiddler n.

1611		Davies of Hereford Scourge of Folly 9: Kate [...] she’s well pleased with all Bum-fiddlers, And hir owne Body stirring still besides.
c.1617		Fletcher Chances I vi: ’Sdeath, have I known Wenches thus long, all the ways of Wenches [...] And am I now bum-fidled with a Bastard?
1630		Tinker of Turvey Epistle 1: Many a Tinkers Trull haue I bum-fiddled.
1682		Buckingham Chances I vi: [as cit. 1617].