To investigate what your co-worker that you don't like is doing so you can hate on them for succeeding.
A car salesmen walks by another salesman's office to evesdrop and find out if the other salesman's customer is going to buy the car. If they buy you can hate on him. If they walk out without buying it makes you happy that he failed. "Hold on Jim has a customer. Let me go investihate."
The undercover investigative element of the British Royal Military Police. An organisation that is supposed to blend into the wider military community to mirror the effect that CID provide to civil police. In reality it is populated by a bunch of barely literate mouth breathers who spend all day taking screenshots of Facebook and being outsmarted by even the slowest witted squaddie. Most likely military group to be Swingers.
In Special Investigation Branch office:
SIB: "Look sunshine, we know you did it, confess or else"
Perp: "I didn't do it"
SIB: "Oh, you sure? Well, you'd better get out of here, we'll be watching you"
Perp: "L8rs"
A disinformation tactic where political party A abuses of their newfound power to publicly accuse and investigate opposition party B for the crimes committed by political party A that subsequently got political party A into power in the first place.
Following their questionable 2022 midterm election victory, the GOP-controlled House commenced investigationgate against Democrats for accusations of election fraud, Hunter Biden’s Laptop, the war in Ukraine among a plethora of other previously planted mass-media conspiracies.