Green’s Dictionary of Slang

tweak v.1

[tweaker n.1 ]

to hit a target with a missile from a catapult.

[UK]Kipling ‘Stalky’ in Complete Stalky & Co. (1987) 18: ‘Tweak ’em, then,’ said Corkran [...] He drew forth a slim, well-worn home-made catapult.

In phrases