Plug, PLUG, plugs, or plugged may refer to:Plug, an insertive closure or stopper (plug) Core plug, used to fill the casting holes on engines Butt plug, a sex toy that is inserted into the rectum Earplug for ear protection Plug (sanitation), a stopper for a drainage outlet Plug (accounting), an unsupported adjustment to an accounting record Plug (fishing), a family of fishing lures Plug (horticulture), a planting technique Plug (jewellery), a type of jewellery worn in stretched piercings Fusible plug, a safety device in steam boilers Hair plug, hair that has undergone hair transplantation Mating plug, secretion used in the mating of some animal species Plug, a step in the manufacturing process for parts made of carbon-fiber-reinforced polymer Plug, a type of chewing tobacco made by pressing tobacco with syrup Plug, the central element of a Plug and feathers, a tool for splitting stone Plug computer, a type of small-form-factor computer Portland Linux/Unix Group (PLUG), a group of Linux enthusiasts in Portland, Oregon Product plug, or product placement in marketing Volcanic plug, a geological landform Wall plug, a fastener that allows screws to be fitted into drywall or masonry walls Plug (plumbing) Plug, a worthless horse