That’s Chilean slang,
‘weá’ may mean many things and almost anything, usually something bad, unimportant, useless, stupid, it’s always used when you refer to something (not a person) here you have some examples:
Qué es esa weá? = what’s that stuff?
Qué weá pasa? = what the f-u-c-k is happening here?
Eso es una weá’ = that’s b-u-l-l-s-h-i-t
Pásame esa weá = give me that stuff
Esa weá no funciona = that f-u-c-k doesn’t work
Estás diciendo puras weás = you’re saying stupid things
Also, anything you don’t know the name of, it’s a ‘weá’
(I would never end giving examples..lol)
Whereas, ‘weón’ means ‘buddy’ or ‘a-s-s-h-o-l-e’, it then may be friendly or offensive
Ese es un weón = he’s a jerk/ a-s-s-h-o-l-e (offensive)
Hola weón = hi buddy (in a friendly way)
No escuches a ese weón = Don’t listen to that a-s-s-h-o-l-e (offensive)
Él es un weón simpático = he’s a nice guy (friendly)
‘weón’ is used for a man, ‘weona’ for a woman also exists.
(Again, I would never end giving examples, lol)
Of course, both words are not used formally.
I hope it’s clear and you understand them now.
What Does Wea Mean
I graduated with a bachelor’s degree in Spanish, and I’ve traveled in Spain and Mexico. I’ve never heard of these two words, but if you are simply spelling them by the way the words sound, then I may be able to help.
‘wea’ when said aloud, may be “guey”, which is Mexican slang similar to the word “cabron”. Both are used between friends. If a person says “ya, guey!”, it means “enough, dude!” I wouldn’t say that dude is the perfect comparison word, but I’m sure it helps.
I have no idea about the second word you listed, but hopefully I’m not wrong about the first. Best of luck.
Slang… could be dude, or a**hole…
it depends 100% on the context