limbs bent; most often, the hands on the hips with elbows bent outward:

To hold and fire two guns, one in each hand. Most often seen with handguns, or compact sub-machine guns.

This is not only the correct term, but also the original, and oldest term for this.

However, Dual-Fisting is the term (created by the Halo community) that
is the most popular and widely accepted.

a belligerent stance with arms slightly bent and elbows facing outward. A predominant form of posturing meant to intimidate and add size to one's physical structure. A common technique often seen in the employ of meathead or Guido assholes as they size each other up at the gym or the club.

to hold 2 pistols, one in each hand. A common image is arms extended, face focused and scrunched, blazing off wildly, NOT shooting both pistols at the same time but alternating each time. Also the shooter can wear a trench coat that's flailing in the wind. Sunglasses are okay too.

To cross/place your arms on your hips.

Spread out, open wide.

To hold two guns of any size and fire alternating to kill shit faster