Noun; A numerical measurement of the extent to which a person is a twat. Similar to electrical wattage, the notable difference being that a higher twattage indicates a dimmer lightbulb rather than a brighter one.
"Dude, that kid Eric is such a douchebag."
"Yeah, honestly, the twattage on that lightbulb must be at least 150."
"That guy is such an asshole...what do you think the twattage on that lightbulb is?"
"Him? Definitely a 200 twatt lightbulb at least."
Your idea about how and/or when the world will end.
"Apocalypinions are like assholes: everyone's got one."
"The world's ending on May 21st? I say it's ending next year on Dec 21st." "Where's your evidence?" "It's just my apocalypinion."