If I find the Spaniards' gold, you needn't expect me to whack up with you.
You play fair with me, an' I'll whack up with you fair and square, dollar for dollar.
The fellow I heard talking 'said he'd go to Shagmon and make Morse whack up.
There's a lot more--I think you understand--than the Montalais plunder to whack up on.
"to strike sharply," 1719, probably of imitative origin. The noun is from 1737. The word in out of whack (1885) is perhaps the slang meaning "share, just portion" (1785), which may be from the notion of the blow that divides, or the rap of the auctioneer's hammer.
The human brain: Slip a microchip into snug contact with your gray matter (a.k.a. wetware)/ wetware: the human brain and its DNA code (1980s+ Computer)