The term "sofa spud" refers to someone who spends a lot of time sitting on the couch, watching TV or playing video games. Some synonyms for this phrase include couch potato, TV addict, lazy bum, and lounge lizard. All these terms are used to describe someone who lacks motivation and spends an excessive amount of time on the couch. They are often associated with a sedentary lifestyle and a lack of physical activity. It's important to note that these terms are not meant to be insulting, rather they highlight a behavior pattern that can be detrimental to one's health and well-being.