Green’s Dictionary of Slang

keck-handed adj.

left-handed.

1937–84		Partridge DSUE (1984) 637: C.19–20.
1998		P. Luff ‘Left-handed Children’ on UK Parliament Commons 22 Jul. 🌐 According to The Economist, researchers preparing a survey of English dialects found 88 different words for left-handed in local use in the 1950s. Such words include [...] keck-fisted [etc.].