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Refers to the percentage of police officers who commit domestic violence, as revealed by multiple studies. Sometimes used in the phrase, "40% of cops beat their wives, and those are only the ones who chose to admit it". Commonly used by people of an anti-police sentiment.
"Hey, you hear about that cop that shot that unarmed kid 27 times?"

"40%, dude."
40% by rawflax March 29, 2019
Related Words
404 40 403 400 407 408 409 401 401k 405
The temperature at which the Celcius and Fahrenheit scales are equivalent. From this point the two scales diverge with 5 degrees Celcius equalling 9 degrees Fahrenheit.

Also very cold.
It was - 40 yesterday, I damn near froze my balls off.
- 40 by monkey40 July 26, 2009
It's blow or smack. 40% purity of either is second tier and most likely to NOT kill the occasional user.
Most people come here because of A Vigilante thinking 40% means a blow job, it just means blow ( or smack ). Unfortunately some drop out screen writer did a search for abuse related terms and stumbled on some elementary school kids definition about swallowing, so now we're all stuck here in the quagmire of a misused 40% slang term making its way into pop culture. In the movie 40% means head because he thinks she's a prostitut; for the rest of us it's just a way to get through the day.
40% by Dirk_Diggl3r September 7, 2019
40% is when a female gives a male head and swallows... Girls that give head and swallow at least once a week have a 40% less likely chance of getting breast cancer so it works out for both parties.
Man-You ready to give me some 40% tonight?
Woman- I can't wait to 40% later on
40% by Kevin J C March 15, 2011
The IQ of John Kerry.
John Kerry has an IQ of -40.
-40 by pseudonym pringles September 14, 2014
Is that a lot? I have no frame of reference.
Hym "That other idiot made it sound like 40% was a ridiculously good offer."
40% by Hym Iam May 31, 2023