"Teto" is a colloquial term used in Mexico to refer to someone who is nerdy, childlike, slow or has a weak demeanor, thus making this person some sort of social outcast. Also commonly referred to as ñoño.

Tetos lack basic social skills and prefer to spend their free time studying, playing video games, or drawing anime characters.

Their fashion icons include the old people that feed ducks at public parks and your dad's accountant.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

An underused acronym for "To Each Their Own". Used when giving respect and or stepping out of an argument on the basis that everyone is entitled to live their life how they choose. Stems from the sadly douche-adopted 'YOLO'

Examples:

—I don't want to go outside today.

#teto
—I was so wasted I couldn't even stand up.

#teto
—I love anime.

#teto
—I smoked two joints before I smoked two joints, and then I smoked two more.
#teto

the coolest mother fucker on the planet

is when a person is naive in spanish

meaning "owner of bitches", a pimp

In Puerto Rico, teto is an imaginary body part which would look like a boob with a penis for nipples.