ammo UK /ˈæ.məʊ/US /ˈæ.moʊ/noun 2verb 1forms 3 noun2 •Ammunition.'Hey, Limey,' called The Robber patiently. 'Come on out or I start using pineapples. I been expectin' you an' I got plenty ammo.' — 1954 •(slang) Chips or money, usually at a casino. verb1 •(informal) To load up on ammunition."Harry and Hassan are getting the car re-ammoed; they dropped me off here. — 2001 formsammoed · ammoing · ammos