"Wallah" is the Arabic way of saying "On God" as in "I swear".
"Say Wallah" can be used to actually
question whether
one's being honest or not, but that's not often the case, Most of the
time it's just the Arabic way of saying "No shit?"
person1. bro, i just found out Axel's mother has
cancer?
person2. Shiit. Say wallah?
person1. On god, man.
person1. EY bro i just realized its friday
person2. mhm, so?
person1. we
don't got
school tmr!!
person2. Say wallah? such a smart discovery you just made.