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1.
Such as guerrilla warfare is an unconventional, or non standardized tactic, guerrilla philosophy is an unstandardized, unsanctioned, or otherwise unusual philosophy.
"What if.... the universe is like, all in the mind of some greater being? And, that greater being's universe is part of another greater beings mind?"

"Whoa dude, that's some serious guerrilla philosophy there man."
by Armand of the Forsaken November 01, 2007