It is used to playfully express in agreement to something. It's an alternative phrase instead of saying "yes". The "yesh" means "yes", and the "mesh" is used to add playfulness as its supposed to be very silly and quite stupid like kindergarten humor.
Tyler: Are we still going to the party?
Jordan: Yesh mesh
Tyler: What the hell does that even mean?
Jordan: It means I am going
Tyler: Why the fuck couldn't you just say "yes"?
Jordan: Because it's more stupid this way
Tyler: Yes you are very stupid and are failing at life
Jordan: ok I'll see you at 5, bye, I go cry now
Jordan: Yesh mesh
Tyler: What the hell does that even mean?
Jordan: It means I am going
Tyler: Why the fuck couldn't you just say "yes"?
Jordan: Because it's more stupid this way
Tyler: Yes you are very stupid and are failing at life
Jordan: ok I'll see you at 5, bye, I go cry now
by NightWalker21 July 27, 2019
by The Donut Fairy May 20, 2016
Lacrosse mesh is the mesh that is strung in the lacrosse head and makes it able for someone to catch the ball so it doesn’t go right the the head.
by Cooooooper April 04, 2018
When the mesh on your lacrosse stick's head is unreasonably long and hangs off of the bottom of your head. You know it when you see it, and just wish you had some scissors to trim it yourself.
by meshmullet93 April 29, 2009
by Leandro October 26, 2004
by SpruceTree April 29, 2008
the part of a mesh lacrosse pocket that hangs down below where the pocket is tied to the bottom of the head; it resembles the "party in the back" portion of the infamous mullet haircut.
by JP_Laxer July 03, 2007