Thump-Thump

 is a unique weapon in Fallout: New Vegas.

Characteristics
is a unique grenade rifle which has the extended range of a barrel extension mod and enhanced AoE radius. It has 30% faster attack speed, 0.5 lower weight, and 25% condition increase compared to a standard launcher. Its unique texture has a lighter coloring and from the right angle you can see that someone scrawled its name on the barrel and an arrow pointing towards the muzzle. There is also a drawing of an angry beaver with red eyes holding a rifle, seemingly an M1 Garand (this Machine), on the stock.

Location
Thump-Thump is found in the Nellis Array generators just south/south-east of the two array generator switches during or after the quest Ant Misbehavin'. It is next to two broken generators, by the skeleton.

Bugs

 * In 3rd person view when you run it will fall, holstered or holding, and may "follow" you. It is still visible in 1st person view. Unequipping it then reequipping will remedy the problem.
 * If a limb is crippled right after firing, you won't have to reload.

Trivia
Thump-Thump is likely a reference to the noise the weapon makes on shooting, having a loud "thump" sound on ejection of the round and the explosion that follows.