The ProLapsGolf Club is a piece of golfing equipment and a melee weapon.
It has moderate power and long reach, allowing the player to attack several enemies providing they are close together. It can be swung whilst stationary, or running. The golf club is a very useful weapon to use on victims on the ground, as it is used very quickly once a person falls down.
If the player enters GTA Online and then goes back to Story Mode, the golf club will disappear from the weapon wheel of all three protagonists. This similiarly happens with Molotov Cocktails and the Baseball Bat.
In GTA Vice City, if the player attacks a person who is lying on the ground or dead, he swings the club as he would for a golf shot.
In GTA V, although the club is not the fastest weapon in combat (as the knife hits faster), it seems to be the fastest weapon to hit whilst running. Subsequently, in scenarios in which two people simultaneously run to melee attack one another, the person wielding golf club tends to strike first.