Definition of "ammo"

ammo

/ˈæ.moʊ/

noun
usually uncountable, plural ammos
1. (informal) Ammunition.
  Quotations
  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
third-person singular simple present ammos, present participle ammoing, simple past and past participle ammoed
1. (transitive, informal) To load up on ammunition.
  Quotations
  "Harry and Hassan are getting the car re-ammoed; they dropped me off here.
  2001, H. Beam Piper, Uller Uprising