Waz. I use it as a blank verb, like when you're trying to tell your mate how to do something, and would otherwise resort to making vague gestures. If you say "Give it a waz", more often that not, they'll figure out what you mean.
The blank noun is Mupsys. The explanation is kinda convoluted. Basically, something minus a vital component = "that-thing mupsys".
Peanut butter + margarine + bread = Peanut Butter Sandwich
Eating peanut butter and margarine off a knife = Peanut Butter Mupsys (it'd be a sandwich if only there was bread).
You get the idea.
Prefixed euphemisms for stuff that sucks:
Suboptimal
Quasi-awesome
Parawonderful
Infra-orgasmic
Other randoms:
Spendy
Excremely
EDIT: actually,
www.peanutbuttermupsys.com would be an awesome domain.