Yer redneck fellas enjoyin' a pleasant Sunday afternoon at their local game-park.

From Wikipedia:
An atlatl or spear-thrower is a tool that uses leverage to achieve greater velocity in dart-throwing.
It consists of a shaft with a cup or a spur at the end that supports
and propels the butt of the dart. The atlatl is held in one hand,
gripped near the end farthest from the cup. The dart is thrown by the
action of the upper arm and wrist. The throwing arm together with the
atlatl acts as a lever. The atlatl is a low-mass, fast-moving extension
of the throwing arm, increasing the length of the lever. This extra
length allows the thrower to impart force to the dart over a longer
distance, thus imparting more energy and ultimately higher speeds.[2]
Common ball throwers (molded plastic shafts used for throwing tennis balls for dogs to fetch) use the same principle