French slang used as a greeting when you meet someone that can be used at any moment of the day. The word is considered low to middle class and was mainly used by immigrants from Africa but it has since become mainstream.
The word "Wesh" means "Monster" in Arabic. Someone who’s untouchable, savage, or dominates everything in their path. Not literally scary, but more like “legendary level.”
Bro look at that one dude in the gym he's a literal "Wesh"
Wesh Aissam, Wesh Aissam spell, or Wesh a Aissam effect is an anomally that happens whenever a person says "Wesh Aissam", it's worth remaking that after the spell was casted a girl becomes wet, or someone gets coffee or semenccino on them
*Drinking some coffee with your friends*
X: WeshAissam Y: *Coffee Spills on them*