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A teen or tween who thinks they know it all, wise fool
Teen+genius=teenius
Sarah rolled her eyes when her parents wouldn't believe that euthanasia was the word to describe children in China... What a teenius.
teenius by Don W Macaulay June 16, 2013
Related Words

the teenies 

The coined term for the new decade of 2010-2019, corresponding with the eighties, nineties, naughties, etc.
OMG, i can't believe we're in the teenies already!
the teenies by KangarooJack69 December 25, 2009
1)(Usually) teenaged girls/boys who try so hard be alternative and not to be part of "mainstream" culture that they get pulled into another "mainstream" culture invented for them while thinking noone else is like them.

2)Usually underage drinkers and usually in early teens. They usually drink too much and take too many drugs often vomiting and needing medical assistance waisting valuable medical staff's time. At the time they may be crying or something similar but then in a few days time this event will go down in theirs and the other teenies minds as a heroic event and they will try to bring up the topic of them vomiting at every possible opurtunity recounting the tale with them as a hero.
Teenies teenies teenies
teenies by Meloph August 4, 2006
Teenies in my eyes are young people (aged 10 - 14) who ty to be like the main subculture around them eg emo scene hxc ect ect. they walk around copying the older sene kids and try to be like them. they claim to like old rock/punk metal ect from the 80's like sex pistols, Ac/Dc, the ramones ect ect. They claim to love bands like enter shikari myspace.com/entershikari and yet get pulled out at almost ever standing show and cant handle pits. they love the colours pink and black and purple and always wear something with skulls on.say the name of a band and within 2weeks it will be ther "fave" band.
OMG i LOVE panic! at the disco the singers soooo hot!! typical teenies
teenies by RaiseHell January 12, 2007

Teefises 

A word used to describe one's teeth, in a serious manner, by a generally uneducated person. Usually refereed to in a quantity of 45.

Is also used by well educated cosmetology students, in a not so serious manner, when referring to the teeth, smile, mouth, eating, etc.
I'm freakin starving. I'm gonna eat this in 5 seconds with all 45 of my teefises.
Teefises by Disgustipat3d July 20, 2011