An acronym popularized and invented by content creator Soosh means, "Man I'm Fired Up!" Meant to be used when hyped up for anything. It should also be noted on how vague it is among his fanbase as it serves as an inside joke as well.
Its like a can of whoop-ass, Japanese-style. Comes from the Japanese actor of the same last name Toshiro Mifune who often portrayed a sword-wielding samurai in the movies.
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."