An expression used to tell someone they have no right to treat you like a nobody or belittle you. It is a way of demanding respect when being looked down upon or dismissed.
To check someone out or enjoy some eye candy. (The expression literally means to have a little eye taco, implying that looking at an attractive person is like treating yourself to a delicious snack).
Let's go to the beach to echarnos un taquito de ojo. We are echándonos un taquito de ojo at this party.
Used to tell someone they did something remarkable, whether good or bad. It means someone killed it or nailed it, though it is often used sarcastically to mean they really blew it. (In Venezuela, marico and weon are used as dude or bro among friends, though they can be offensive in other contexts).
Dude, te la comiste on stage. / Man, te la comiste with that girl. / Te la comiste, Gabriel, getting a zero in math: you just earned a punishment.