It is a use of ICAO spelling alphabet and the initials stand for "Adios, Mother F**ker".

It is used mostly by military personnel.

The cast of Foxtrot - 2013 includes: Joel Montgrand as The Groom Kalki Ortiz as Man 2 Sotos Petrides as Taxi Driver Rebecca Strom as The Bride

Alpha, Bravo, Charlie, Delta, Foxtrot

Alpha, Bravo, Charlie, Delta, Echo, Foxtrot, Guerrilla, Hotel, Indigo, Juliet, Kilo, Lion?, Mike, and i can name the rest Z: Zulu...

"Victor, India, Echo, Tango, November, Alpha, Mike..."

"Whiskey, Alpha, Romeo."

(*US military alphabet; Alpha, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliet, Kilo, Lima, Mike, November, Oscar, Papa, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu.)