1. Swalla can be used in the same context as "holla" or "holla back."
Ex.) Swalla back!
2. Swalla can also be an insult meaning that you are lame or not good at something.
Ex.) "You swalla hard." or "You're such a swallaer"
Def.1. Ex.) Swalla back!
Def.2. Ex.) "You swalla hard." or "You're such a swallaer"