What does RPG mean in military terms?

In English, it translates to "rocket propelled grenade." Developed by the USSR and colloquially known as an RPG launcher, it is a shoulder-fired anti-tak weapon that fires rockets equipped with an explosive warhead.

Unlike what most people think, rpg does not stand for rocket propelled grenade, but instead ruchnoy protivotankovyy granatomyot which is Russian. It translates into hand held anti-tank grenade launcher.