A combination of the words: Stupid and Douchebag. A more efficient way to call someone really stupid who is also acting like a douchebag at the same time. While it may seem redundant, Stuchebag is used when "douchebag" alone does not convey the level of douchebaggery going on.
The act of being a stuchebag is: Stuchebaggery. As in: the amount of stuchebaggery being displayed by that kid is astounding. Somebody should punch him in his pussy.
Did you see what Jared did at the company picnic? He was not only completely shitfaced and making a fool of himself in front of the little kids trying eat their lunch.... but he was hitting on the CEO's wife while the CEO was standing there. What a complete stuchebag!
A generally irritating individual, generally male, that exhibits a verbal display of over-valuing the sound of his/her voice and opinions, and and under-valuing the potential contributions of his/her companion of the moment. Said opinion, developed and expressed on almost everything, is delivered with suggestive or self-serving overtones in order to inflate the orator's opinion of self and/or to garner a sexual experience from the companion. Said conversations tend not to last very long or achieve intended results, unless companion is under the influence of alcohol or other vision/hearing/perception-altering substances. Arising from English "schmoozer" and "douchebag".
Look at shitgrin Derek over there trying to get into CindyLou's pants by talking her up about his dumb Subaru Brat...what a total SCHMOUCHEBAG!!