When a person is lacking or is bad at a given skill. From the words: skill and the portuguese word for garbage, "lixo". Also, a derivation from the expression skill issue.
Zezocas: "My code doesn't work."
Meruje: "That's because you're skilixo at coding."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.