The act of trying to remember the day after a night of heavy drinking by going through receipts, bank statements and messages.
Me: "CSI hangover was hard work, today mate, I couldn't find anything about where I had been last night"
Friend: "check your Uber trips; see where you been"
by MrBlueSea June 10, 2019
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an acronym for a group called Coffee Society Internationale.

a supposedly 'coffee' drinking group that attempts to create the illusion of sophistication and an excuse for a good flirt. Also where half of the members don't drink coffee.

Often gets nicknamed Gay-S-I by peers & is looked down upon in regular society.
'CSI is on today you gonna come?'

'I thought that group was dead...'
by ACIM January 30, 2009
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CSI is an acronym.

It stands for:

Creepy
Science
Intern

It's generally used for those people who know way too much about science, and tend to talk about creepy things concerning it.

It is also used when referring to a government group that goes under the same name, but that's not used very often except when referring to the television programs.
"Man, what a CSI - I think we have a secret pedobear on the loose. Somebody phone the police..."
by Genevieve Am I June 23, 2011
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CSI stands for crime scene investigation and its a show that takes place in miami and new york
that new CSI episode was lit
by asseater5556 August 14, 2023
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An acryonym for the 'Canadian Security Intelligence Service'. Their headquarters is located in Ottawa, Ontario, Canada. They do their work mainly in Canada although some agents do go abroad to collect intelligence. They are a known ally of the CIA and do most of their work collaborating with them.
"You would not believe what happened today, I had to invade a CSIS blacksite to obtain some data."
by yogha October 19, 2023
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