Where does “teenagese” come from?

teenagese (English) comes from English teenage, from English age, from Middle English age, from Old French aage, from Vulgar Latin aetaticum, from Latin aetās, from Latin aevitās, from Proto-Italic aiwotāts — vital force, life, age, eternity; day, morning.

Ancestry of “teenagese”, step by step

teenagese traces back through two separate lines of ancestry.

via English teenage

StepLanguageWordMeaning
1EnglishteenageBrushwood for fences and hedges; Of or relating...
2EnglishageThe whole duration of a being, whether animal,...
3Middle EnglishageThe age of someone or rarely something; how old someone is
4Old Frenchaageage
5Vulgar Latinaetaticumage
6Latinaetāsthe period of a life: lifetime, lifespan
7Latinaevitās
8Proto-Italicaiwotātsage
9Proto-Indo-Europeanh₂eyu-vitality; eternal; vital force, life, long life,...
10Proto-Indo-Europeanh₂ey-vital force, life, age, eternity; day, morning

via English ese

StepLanguageWordMeaning
1Englishesedude, man
2Mexican SpanisheseThe name of the Latin-script letter S; that;...
3Latinipsehimself, herself, itself, the very, the actual;...
4Proto-Italic*e(s)pesohimself, herself, itself
Every word from Proto-Indo-European h₂ey-Every word from Proto-Indo-European h₂eyu-Every word from Proto-Italic aiwotāts
teenagese — Etymology, Origin & Word History | Etymology Explorer