Shooty
"Shooty" is Warhammer 40,000 player slang to describe a unit or army that is designed around ranged engagement rather than close combat. Tau armies in particular are typically shooty armies, since they have very powerful ranged weaponry but are poor at mêlée.
And the Imperial Guard, because while their guns are quite as big (they arnt compensating for anything, see balls of steel) they have FUCKING TRUCK LOADS of guns in a average IG army, porbably easily twice what other have.