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1.
Something disguised to seem affiliated with a group OTHER THAN the one it really is affiliated with. For example, a "false flag operation" is a terrorist act committed by one group for the express purpose of discrediting another group, which is framed for it.

False flag operations in warfare are usually conducted at sea. They are generally speaking illegal, although there are loopholes. The object is to disguise one's own vessel as friendly to the enemy until it is possible to engage said enemy.
In 1980, right wing neo-fascists in Italy carried out a terrorist bombing of a waiting room in a Bologna train station. 85 people were killed. At the time, it was the deadliest terrorist attack in Europe since the end of the War.

At the time, it was blamed on Communists; and indeed, soon after, the PCI was badly beaten in parliamentary elections. In reality, it was a false flag operation carried out by fascists. Members of the notorious P2 Masonic Lodge protected the identities of the perpetrators and later interfered with the investigation.
by Severed Cow Head September 10, 2010
 
2.
African American street gang-related slang which refers to the act of representing onesself as a member of an urban family (E.g., Vice Lord, Blackstone, Disciple, etc.) when one doesn't actually belong to that family.
Homeboy got touched up for false flaggin'. We don't play that in the wild hunneds.
by stagolee June 12, 2009
 
3.
A fake boner created by tightening a belt too tightly and having your pants zipper go up, giving the impression of a boner.
My girlfriend slapped me when I was looking at another women and got a False Flag.
by Gregorovich Bumfunder September 05, 2009