In role playing games, particularly those of the Japanese variety, the practice of gaining levels excessively in order to be able to defeat a boss character. The term is most appropriately used when the boss or bosses being levelled for can be normally defeated without too much challenge. In the case of wusselling up, the player in question lacks skill, or is a newbie.
Wusselling up should not be confused with bad game design that requires the player to level excessively as a matter of course. See Disgaea.
My wife always gets laughter from the crowd when she points out that my dickydoo is no worse than her wussydoo. Some smartass always says, "what's a wussydoo"? Her reply, it's when my belly sticks out further than my wussydoo.
When something is broken on your vehicle and you improve the repair. It has been re-engineered by a mythical genius to never break again. Everything around it will actually become stronger. It has something to do with the magical fingers of the mechanic who fixes such problems. The person who can "Wessed up" repairs holds the key to the center of the time and space continuum.
"Yep, Your damn frame is rotted and your bumper is dragging the ground. Everytime we put oil in, it leaks all down the damn road. I mean Wes has some time to wave the harry potter wand at your Piece of shit and we'll get ya Wessed up and running again.