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The inherent discrimination of teenagers by the rest of the population. Commonly assumed to be mentally deficient, whiney, ungrateful, lazy, and other negative traits. Often incited by the age old perception that has been passed down through generations. Can be immensely frustrating for a teenager, as they are often spoken to condescendingly or treated as an inevitable criminal.
Note that this is not limited to adults discriminating against said teenagers. Teenagers can discriminate among their own age group, or adolescents slightly younger/older.
Example of teenism:
Arbitrary and whiney comments and facebook posts including but not limited to:
-I swear this is the most screwed up generation
-Any sentance starting with "kids these days"
Also observed in general conversation.
Teenism by arbitrary pseudonym January 3, 2014
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A very small penis (Tea-nis)
Friend: My boyfriend doesn't want to have sex

Other friend: He probably has a teenis
Teenis by Trash bag69 November 21, 2018
Related Words
A "Teenis" is a tiny penis.
I asked her why her clit was so big and she told me it was her "teenis".
Teenis by JS Bach November 1, 2011

Teenis Pail 

Stab it! Stab it with your Teenis Pail!”
Teenis Pail by M_ike July 18, 2020

Teenis Pail 

When you play Alien: Isolation for so long, you can’t pronounce Penis Tail correctly |:
Stab it! Stab it with your Teenis Pail!”
Teenis Pail by M_ike July 18, 2020
Being unable to go through an everyday social interaction with a stranger, such as a shop assistant, without making a light hearted comment which makes the situation more awkward
Friend 1 to waiter "I'll have a hot chocolate please"
Friend 2 to waiter "Excuse my child of a friend, I'll have a filter coffee please"
Friend 1 to friend 2 "See what I mean, you suffer from teejism"
Teejism by Derbz89 December 5, 2011
A tennis class consisting of teenagers
Murr: I taught a tennis class full of teenagers. I called it teenis.
teenis by EvanKnish November 25, 2021