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When you are surrounded by Arabic people and in order to ensure you are saying the truth they tell you to "say wallah"
Mark: "That hot girl Trixie was all over me last night"
Ahmed: "Really? Say wallah"
Mark: "Wallah man, I swear"
by Leanasaur January 02, 2010
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May 3 Word of the Day
Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)
Monica: Oh yay! I made a new mutual today because we started following & talking to eachother on twitter and we like eachother (so it seems).
by qtheresurrection March 25, 2015
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2
"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.
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