HELP!! Do you know the meaning of

[Jhonatan]

Hi! My name is Jhonatan, im from Peru. :D
does anyone know the meaning of

lol
rofl
omg
bb
nvm
lil
btw
wtf
np
ttyl

well if u have more of this kind of "short words" please post them
It's a good way to make new friends also. See You