A plastic worm is a plastic fishing lure, generally made to simulate an earthworm. Plastic worms can carry a variety of shapes, colors and sizes, and are made from a variety of synthetic polymers. Some are even scented to simulate live bait.

Plastic worms can be rigged on the line many different ways. Commonly they are used with a small fish hook

Fish hook

A fish hook is a device for catching fish either by impaling them in the mouth or, more rarely, by snagging the body of the fish. Fish hooks have been employed for centuries by fishermen to catch fresh and saltwater fish. In 2005, the fish hook was chosen by Forbes as one of the top twenty tools...

 and a split shot weight to keep the lure deeper in the water. The fishing equipment recommended is a 7 foot fishing rod

Fishing rod

A fishing rod or a fishing pole is a tool used to catch fish, usually in conjunction with the pastime of angling, and can also be used in competition casting. . A length of fishing line is attached to a long, flexible rod or pole: one end terminates in a hook for catching the fish...

 with 8 to 10lb fishing line.

A common fishing strategy is to configure them as a Texas Rig

Texas Rig

The Texas rig is a technique used for fishing with soft plastic lures. It involves a bullet-shaped weight being threaded onto the fishing line first followed by an optional glass or plastic bead, and then the line is secured to a hook, usually an offset worm hook.The hook is then inserted into the...

, and bounce them off the bottom. The key is to jig near or in cover such as weeds and trees, this technique is commonly referred to as flipping and pitching.
"Twister Worm" is commonly called a grub, not a "twister worm", even though the action of the tail is defined as a twisting motion of the body resembling that of a grub.

Generally there is but one type of worm, the plastic worm. This worm comes in a variety of lengths, styles, and colors to attract different fish species. Ironically, the plastic worm, sometimes called a "trout worm ", is often unreliable as a lure for trout fishing, and therefore many anglers do not use them for trout fishing. Bass and panfish species (bluegill, sunfish, etc) tend to bite these lures more than other species.