Colombian slang, specifically from Medellin or "The paisa
zone".
It means someone who is skillful when doing
something specific, it's used as a noun.
Ese Profesor es muy teso // That
teacher is really good (at teaching)
Mariana Pajon es muy tesa // Mariana Pajon is really skillful (Given the context that she is a BMX world champion, you automatically understand we'
re talking about Mariana Pajon being good at BMX) //
-Hey Sebas, cuanto es 1345 X 3423.
-4.603.
935, ni siquiera tuve que pensarlo
-Uy Marica!, used es muy teso
-Hey Sebas, how much is 1345 X 3423.
-4.603.935, I didn't
even have to think about it.
-BRO! You are so good at math.
Teso/Tesa