whack up verb 11whack-up noun 1forms 4 verb11 •(slang) To strike someone or something repeatedly or very forcefully.They got whacked up in the air a bit, and after that Humphries decided he needed a Rule 43 protection in the block —isolation from other prisoners. — 2009 •To increase or raise by a sizeable amount.Every time they need more money, they whack up personal income tax and they spend the money. They need more money ; they whack up excise on fuel. — 2001 •(slang) To hit, send, or move forward or upward quickly or forcefully.Swinging through, the batter whacks it up the left field line . — 2001 •(slang) To cut up or chop up.I have whacked up some wood, and I'm sure of this fact, that it pays to be good. — 1911 •(slang) To create or produce in a sudden or haphazard manner.Or perhaps you'd like a row of outlets over a workbench. Another guard whacks up metal raceway in minutes. — 1956 •(slang) To gather together; to accumulate or come up with.The men was all to the Banks, and Counahan he whacked up an iverlastin' hard crowd fer crew. — 1897 •(slang) To pay, especially reluctantly or with difficulty; to cough up; to shell out.I said in th' letter that'd I'd whack up half. — 1958 •(slang) To divide into shares; divvy.We'll whack up fair with you, Hitchcock. In everything you'll get your quarter-share, neither more nor less; and you can take it or leave it. — 1901 •(slang) To mess up.Did he get whacked up on ninety-nines and trash your auntie's shop? — 2011 •(slang) To inject an illegal drug.If I tried to whack up I wouldn't get a vein it would clog up with blood, the works, the syringe, would clog up with blood and that's it, — 2003 •(slang) To control or dominate someone or something in a thorough or severe manner.District 50 is trying to whack up the AFL- CIO, " said Carlough, "why doesn't the AFL - CIO go out and whack up District 50?" — 1961 whack-up noun1 •Synonym of whack (“a division of an amount into separate whacks, a divvying up”). formswhacked up · whacking up · whacks up · whack-ups