ammo

Etymology

Clipping of ammunition + -o.

noun

1. (informal) Ammunition.
   Under fire when this magazine is emptied you shout for “ammo” but perhaps No. 2, the ammo carrier, is lying in the rear with a bullet through his napper. Then it's “napoo-fini” (Tommy's French) for Mr. Lewis. 1917, Arthur Guy Empey, “Lewis Gun”, in Over the Top, G. P. Putnam's, page 297
   As with handguns and rifles, some ammos are more accurate than others. 2011, Mark Brannon, Tom Hanrahan, Shooting Sporting Clays, page 39

verb

1. (transitive, informal) To load up on ammunition.
   "Harry and Hassan are getting the car re-ammoed; they dropped me off here. 2001, H. Beam Piper, Uller Uprising