Green’s Dictionary of Slang

echoic of a blow.

1883		Life 1 292: Biff ! Yerp ! Bing ! Snayze ! He whacked the horse on the nostrils with absolute abandon.
1886		Aberdeen Eve. Express 17 May 4/2: He no sooner had the words out of his mouth than ‘biff’ went a canvasman’s fist in his face.
1891		Belford’s Mag. 6 341: Jack hit out with a will, straight from the shoulder: biff! bang! biff!
1902		Laurens Advertiser (SC) 15 Jan. 4/2: Biff! sizz! the ball went out of the parson’s right hand like a rifle shot.
1902		Truth (Brisbane) 19 Oct. 3/3: biff, smash, smack went their open hands on one another’ss faces.
1903		Minneapolis Jrnl (MN) 5 May 4/6: The first round was biff-bang from the start.
1905		Marvel III:53 30: Biff! a rotten egg exploded [...] on the end of his nose.
1908		Magnet 22 Feb. 3: Biff! Harry Wharton’s hand clenched and shot out.
1913		J. London Valley of the Moon (1914) 210: Biff! Bang! Bingo! Swat! Zooie! Ker-slambango-blam!
1916		T.W.H. Crosland ‘Joffre’ War Poems 65: He just waits and waits and waits – / Watchful Joffre! / Then he pounces – un, deux – biff! / Takes ’em right in the midriff.
1941		G. Kersh They Die with Their Boots Clean 2: We’re firing for our lousy old lives, biff! — bosh! — bang! — with the Wogs going down like coconuts.
1982		Beano 16 Jan. 3: Biff! Bash! Thump!
2000		Guardian Rev. 19 May 5: Biff! Bang! Pow!
2014		Observer 13 Apr. 7/4: Threats of violence [...] can be leavened if made cartoonish with ‘biff,’ ‘blam,’ [and] ‘kersplat’.